Anti-jagged antibodies and methods of use

ABSTRACT

The disclosure provides anti-Jagged antibodies and methods of using the same.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a non-provisional application filed under 37 C.F.R.§1.53(b)(1), claiming priority under 35 U.S.C. §119(e) to U.S.Provisional Application Ser. No. 61/682,640, filed Aug. 13, 2012, andU.S. Provisional Application Ser. No. 61/784,332, filed Mar. 14, 2013,the contents of which are hereby incorporated by reference in theirentirety.

SEQUENCE LISTING

The instant application contains a Sequence Listing which has beensubmitted in ASCII format via EFS-Web and is hereby incorporated byreference in its entirety. Said ASCII copy, created on Aug. 9, 2013, isnamed P4959R1_WO_SeqList.txt and is 121,708 bytes in size.

FIELD OF THE INVENTION

The present invention relates to anti-Jagged antibodies and methods ofusing the same.

BACKGROUND

The Notch signaling pathway regulates a diverse array of cell functions(Kopan et al., Cell 137, 216-233 (2009)). Four Notch receptors have beenidentified in mammals, i.e., Notch 1-4, that share basic structuralelements that include an extracellular domain, a transmembrane domain,and an intracellular domain. Similarly, the canonical ligands of Notchshare certain structural similarities but a number of non-canonicalligands of Notch have also been identified (Kopan et al., Cell 137,216-233 (2009)). The five canonical ligands in mammals are Delta-like 1,Delta-like 3, Delta-like 4, Jagged1 and Jagged2. Binding of a Notchligand to the extracellular domain of a Notch receptor sets a signalingcascade in motion that begins with proteolytic cleavage at theextracellular S2 site by an alpha secretase of the ADAM (a disintegrinand metalloprotease) family. Cleavage at S2 is followed by proteolyticcleavage by a gamma secretase at the intracellular S3 site, whichresults in release of the intracellular domain and downstream eventsthat ultimately activate Notch-dependent transcription factors such asHes1 and Hey.

Because aberrant Notch expression and signaling has been implicated in anumber of diseases, including cancer (Koch et al., Cell. Mol. Life Sci.64, 2746-2762 (2007)), modulators of Notch signaling have beeninvestigated as possible therapeutic agents for such diseases. Forexample, gamma secretase inhibitors have been tested in clinical trialsfor their effectiveness in treating various malignancies (Shih et al,Cancer Res. 67, 1879-1882 (2007)). Gamma secretase inhibitors preventcleavage at S3 and thereby prevent signaling through Notch receptors.However, gamma secretase inhibitors do not distinguish individual Notchfamily members and therefore inhibit signaling through multiplereceptors at once, as well as through unrelated pathways (Beel et al.,Cell. Mol. Life Sci. 65, 1311-1334 (2008)). Consequently, administrationof gamma secretase inhibitors is associated with intestinal toxicitymarked by weight loss and intestinal goblet cell metaplasia, indicativeof a role for Notch in determining cell fate by maintainingproliferation of intestinal crypt progenitor cells and prohibitingdifferentiation to a secretory cell fate (See van Es et al., Nature435:959-963 (2005)). Similarly, inhibition of both Notch1 and Notch2signaling via conditional Notch gene knockout (Riccio et al., EMBO Rep.9:377-383 (2008)) or via antagonist antibody inhibition (US PatentApplication Publication No. 2010/0080808) also causes intestinal gobletcell metaplasia.

Because of serious toxicity associated with inhibitors of multiple Notchreceptors, there is a great need in the art for targeted inhibition ofsignaling through specific receptors.

SUMMARY

The invention provides anti-Jagged antibodies and methods of using thesame.

In one aspect, the invention provides an isolated antibody that binds toJagged1. In one embodiment, the antibody is an antagonist ofJagged1-mediated signaling. In one embodiment, the antibody comprises atleast one, two, three, four, five, or six HVRs selected from: (a) HVR-H1comprising the amino acid sequence of SEQ ID NO:81; (b) HVR-H2comprising an amino acid sequence of SEQ ID NO:84; (c) HVR-H3 comprisingan amino acid sequence of SEQ ID NO:87; (d) HVR-L1 comprising the aminoacid sequence of SEQ ID NO:110; (e) HVR-L2 comprising the amino acidsequence of SEQ ID NO:111; and (f) HVR-L3 comprising an amino acidsequence of SEQ ID NO:114. In one embodiment, the antibody comprises:(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:81; (b) anHVR-H2 comprising the amino acid sequence of SEQ ID NO:82; (c) an HVR-H3comprising the amino acid sequence of SEQ ID NO:85; (d) an HVR-L1comprising the amino acid sequence of SEQ ID NO:110; (e) an HVR-L2comprising the amino acid sequence of SEQ ID NO:111; and (f) an HVR-L3comprising the amino acid sequence of SEQ ID NO:112. In one embodiment,the antibody comprises: (a) an HVR-H1 comprising the amino acid sequenceof SEQ ID NO:81; (b) an HVR-H2 comprising the amino acid sequence of SEQID NO:82; (c) an HVR-H3 comprising the amino acid sequence of SEQ IDNO:86; (d) an HVR-L1 comprising the amino acid sequence of SEQ IDNO:110; (e) an HVR-L2 comprising the amino acid sequence of SEQ IDNO:111; and (f) an HVR-L3 comprising the amino acid sequence of SEQ IDNO:113. In one embodiment, the antibody comprises: (a) an HVR-H1comprising the amino acid sequence of SEQ ID NO:81; (b) an HVR-H2comprising the amino acid sequence of SEQ ID NO:83; (c) an HVR-H3comprising the amino acid sequence of SEQ ID NO:85; (d) an HVR-L1comprising the amino acid sequence of SEQ ID NO:110; (e) an HVR-L2comprising the amino acid sequence of SEQ ID NO:111; and (f) an HVR-L3comprising the amino acid sequence of SEQ ID NO:112.

In another aspect, the invention provides an isolated antibody thatbinds to Jagged2. In one embodiment, the antibody is an antagonist ofJagged2-mediated signaling. In one embodiment, the antibody comprises atleast one, two, three, four, five, or six HVRs selected from: (a) HVR-H1comprising the amino acid sequence of SEQ ID NO:88; (b) HVR-H2comprising the amino acid sequence of SEQ ID NO:89; (c) HVR-H3comprising an amino acid sequence of SEQ ID NO:94; (d) HVR-L1 comprisingthe amino acid sequence of SEQ ID NO:115; (e) HVR-L2 comprising theamino acid sequence of SEQ ID NO:116; and (f) HVR-L3 comprising an aminoacid sequence of SEQ ID NO:122. In one embodiment, the antibodycomprises: (a) an HVR-H1 comprising the amino acid sequence of SEQ IDNO:88; (b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:89;(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:90; (d) anHVR-L1 comprising the amino acid sequence of SEQ ID NO:115; (e) anHVR-L2 comprising the amino acid sequence of SEQ ID NO:116; and (f) anHVR-L3 comprising the amino acid sequence of SEQ ID NO:117. In oneembodiment, the antibody comprises: (a) an HVR-H1 comprising the aminoacid sequence of SEQ ID NO:88; (b) an HVR-H2 comprising the amino acidsequence of SEQ ID NO:89; (c) an HVR-H3 comprising the amino acidsequence of SEQ ID NO:91; (d) an HVR-L1 comprising the amino acidsequence of SEQ ID NO:115; (e) an HVR-L2 comprising the amino acidsequence of SEQ ID NO:116; and (f) an HVR-L3 comprising the amino acidsequence of SEQ ID NO:118. In one embodiment, the antibody comprises:(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:88; (b) anHVR-H2 comprising the amino acid sequence of SEQ ID NO:89; (c) an HVR-H3comprising the amino acid sequence of SEQ ID NO:90; (d) an HVR-L1comprising the amino acid sequence of SEQ ID NO:115; (e) an HVR-L2comprising the amino acid sequence of SEQ ID NO:116; and (f) an HVR-L3comprising the amino acid sequence of SEQ ID NO:119. In one embodiment,the antibody comprises: (a) an HVR-H1 comprising the amino acid sequenceof SEQ ID NO:88; (b) an HVR-H2 comprising the amino acid sequence of SEQID NO:89; (c) an HVR-H3 comprising the amino acid sequence of SEQ IDNO:92; (d) an HVR-L1 comprising the amino acid sequence of SEQ IDNO:115; (e) an HVR-L2 comprising the amino acid sequence of SEQ IDNO:116; and (f) an HVR-L3 comprising the amino acid sequence of SEQ IDNO:120. In one embodiment, the antibody comprises: (a) an HVR-H1comprising the amino acid sequence of SEQ ID NO:88; (b) an HVR-H2comprising the amino acid sequence of SEQ ID NO:89; (c) an HVR-H3comprising the amino acid sequence of SEQ ID NO:93; (d) an HVR-L1comprising the amino acid sequence of SEQ ID NO:115; (e) an HVR-L2comprising the amino acid sequence of SEQ ID NO:116; and (f) an HVR-L3comprising the amino acid sequence of SEQ ID NO:121.

In another aspect, the invention provides an isolated antibody thatbinds to Jagged1 and Jagged2 (Jagged1/2). In one embodiment, theantibody is an antagonist of Jagged1/2-mediated signaling. In oneembodiment, the antibody comprises at least one, two, three, four, five,or six HVRs selected from: (a) an HVR-H1 comprising the amino acidsequence of SEQ ID NO:95; (b) an HVR-H2 comprising the amino acidsequence of SEQ ID NO:96; (c) an HVR-H3 comprising an amino acidsequence of SEQ ID NO:99; (d) an HVR-L1 comprising the amino acidsequence of SEQ ID NO:123; (e) an HVR-L2 comprising the amino acidsequence of SEQ ID NO:124; and (f) an HVR-L3 comprising an amino acidsequence of SEQ ID NO:127. In one embodiment, the antibody comprises:(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:95; (b) anHVR-H2 comprising the amino acid sequence of SEQ ID NO:96; (c) an HVR-H3comprising the amino acid sequence of SEQ ID NO:97; (d) an HVR-L1comprising the amino acid sequence of SEQ ID NO:123; (e) an HVR-L2comprising the amino acid sequence of SEQ ID NO:124; and (f) an HVR-L3comprising the amino acid sequence of SEQ ID NO:125. In one embodiment,the antibody comprises: (a) an HVR-H1 comprising the amino acid sequenceof SEQ ID NO:95; (b) an HVR-H2 comprising the amino acid sequence of SEQID NO:96; (c) an HVR-H3 comprising the amino acid sequence of SEQ IDNO:98; (d) an HVR-L1 comprising the amino acid sequence of SEQ IDNO:123; (e) an HVR-L2 comprising the amino acid sequence of SEQ IDNO:124; and (f) an HVR-L3 comprising the amino acid sequence of SEQ IDNO:126.

In another embodiment, the antibody comprises at least one, two, three,four, five, or six HVRs selected from: (a) an HVR-H1 comprising an aminoacid sequence of SEQ ID NO:105; (b) an HVR-H2 comprising the amino acidsequence of SEQ ID NO:106; (c) an HVR-H3 comprising an amino acidsequence of SEQ ID NO:109; (d) an HVR-L1 comprising the amino acidsequence of SEQ ID NO:128; (e) an HVR-L2 comprising the amino acidsequence of SEQ ID NO:129; and (f) an HVR-L3 comprising an amino acidsequence of SEQ ID NO:134. In one embodiment, the antibody comprises:(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:100; (b)an HVR-H2 comprising the amino acid sequence of SEQ ID NO:106; (c) anHVR-H3 comprising the amino acid sequence of SEQ ID NO:107; (d) anHVR-L1 comprising the amino acid sequence of SEQ ID NO:128; (e) anHVR-L2 comprising the amino acid sequence of SEQ ID NO:129; and (f) anHVR-L3 comprising the amino acid sequence of SEQ ID NO:130. In oneembodiment, the antibody comprises: (a) an HVR-H1 comprising the aminoacid sequence of SEQ ID NO:100; (b) an HVR-H2 comprising the amino acidsequence of SEQ ID NO:106; (c) an HVR-H3 comprising the amino acidsequence of SEQ ID NO:108; (d) an HVR-L1 comprising the amino acidsequence of SEQ ID NO:128; (e) an HVR-L2 comprising the amino acidsequence of SEQ ID NO:129; and (f) an HVR-L3 comprising the amino acidsequence of SEQ ID NO:131. In one embodiment, the antibody comprises:(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:101; (b)an HVR-H2 comprising the amino acid sequence of SEQ ID NO:106; (c) anHVR-H3 comprising the amino acid sequence of SEQ ID NO:107; (d) anHVR-L1 comprising the amino acid sequence of SEQ ID NO:128; (e) anHVR-L2 comprising the amino acid sequence of SEQ ID NO:129; and (f) anHVR-L3 comprising the amino acid sequence of SEQ ID NO:132. In oneembodiment, the antibody comprises: (a) an HVR-H1 comprising the aminoacid sequence of SEQ ID NO:102; (b) an HVR-H2 comprising the amino acidsequence of SEQ ID NO:106; (c) an HVR-H3 comprising the amino acidsequence of SEQ ID NO:107; (d) an HVR-L1 comprising the amino acidsequence of SEQ ID NO:128; (e) an HVR-L2 comprising the amino acidsequence of SEQ ID NO:129; and (f) an HVR-L3 comprising the amino acidsequence of SEQ ID NO:133. In one embodiment, the antibody comprises:(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:103; (b)an HVR-H2 comprising the amino acid sequence of SEQ ID NO:106; (c) anHVR-H3 comprising the amino acid sequence of SEQ ID NO:107; (d) anHVR-L1 comprising the amino acid sequence of SEQ ID NO:128; (e) anHVR-L2 comprising the amino acid sequence of SEQ ID NO:129; and (f) anHVR-L3 comprising the amino acid sequence of SEQ ID NO:132. In oneembodiment, the antibody comprises: (a) an HVR-H1 comprising the aminoacid sequence of SEQ ID NO:104; (b) an HVR-H2 comprising the amino acidsequence of SEQ ID NO:106; (c) an HVR-H3 comprising the amino acidsequence of SEQ ID NO:107; (d) an HVR-L1 comprising the amino acidsequence of SEQ ID NO:128; (e) an HVR-L2 comprising the amino acidsequence of SEQ ID NO:129; and (f) an HVR-L3 comprising the amino acidsequence of SEQ ID NO:132.

In certain embodiments of the invention, any of the above embodiments isa monoclonal antibody. In certain embodiments, any of the aboveembodiments is a human, humanized, or chimeric antibody. In certainembodiments, any of the above embodiments is an antibody fragment.

In another aspect, the invention provides an isolated antibody asdescribed above, further comprising a light chain variable domainframework FR1 comprising the amino acid sequence of SEQ ID NO:60; FR2comprising the amino acid sequence of SEQ ID NO:61; FR3 comprising theamino acid sequence of SEQ ID NO:62; and FR4 comprising the amino acidsequence of SEQ ID NO:135. In some embodiments, the antibody comprises aheavy chain variable domain framework FR1 comprising the amino acidsequence of SEQ ID NO:50; FR2 comprising the amino acid sequence of SEQID NO:136; FR3 comprising the amino acid sequence of SEQ ID NO:57; andFR4 comprising the amino acid sequence of SEQ ID NO:35. In someembodiments, the antibody comprises a heavy chain variable domainframework FR1 comprising the amino acid sequence of SEQ ID NO:50; FR2comprising the amino acid sequence of SEQ ID NO:48; FR3 comprising theamino acid sequence of SEQ ID NO:57; and FR4 comprising the amino acidsequence of SEQ ID NO:35.

In another aspect, the invention provides an isolated antibody thatbinds to Jagged1, comprising (a) a VH sequence having at least 95%sequence identity to the amino acid sequence of SEQ ID NO:10; (b) a VLsequence having at least 95% sequence identity to the amino acidsequence of SEQ ID NO:19; or (c) a VH sequence as in (a) and a VLsequence as in (b). In some embodiments, the antibody comprises a VHsequence of SEQ ID NO:10. In some embodiments, the antibody comprises aVL sequence of SEQ ID NO:19. In some embodiments, the antibody comprisesa VH sequence of SEQ ID NO:10 and a VL sequence of SEQ ID NO:19. In someembodiments, the antibody comprises (a) a VH sequence having at least95% sequence identity to the amino acid sequence of SEQ ID NO:11; (b) aVL sequence having at least 95% sequence identity to the amino acidsequence of SEQ ID NO:20; or (c) a VH sequence as in (a) and a VLsequence as in (b). In some embodiments, the antibody comprises a VHsequence of SEQ ID NO:11. In some embodiments, the antibody comprises aVL sequence of SEQ ID NO:20. In some embodiments, the antibody comprisesa VH sequence of SEQ ID NO:11 and a VL sequence of SEQ ID NO:20.

In another aspect, the invention provides an isolated antibody thatbinds to Jagged1, comprising (a) a VH sequence having at least 95%sequence identity to the amino acid sequence of SEQ ID NO:15; (b) a VLsequence having at least 95% sequence identity to the amino acidsequence of SEQ ID NO:24; or (c) a VH sequence as in (a) and a VLsequence as in (b). In some embodiments, the antibody comprises a VHsequence of SEQ ID NO:15. In some embodiments, the antibody comprises aVL sequence of SEQ ID NO:24. In some embodiments, the antibody comprisesa VH sequence of SEQ ID NO:15 and a VL sequence of SEQ ID NO:24.

Any of the above embodiments may be a full-length IgG1 antibody.

In another aspect, the invention provides an isolated antibody thatcompetes with any of the above embodiments for specific binding toJagged1. In another aspect, the invention provides an isolated antibodythat competes with any of the above embodiments for specific binding toJagged2. In another aspect, the invention provides an isolated nucleicacid encoding an isolated antibody of the above embodiments. In afurther aspect, the invention provides a host cell comprising theisolated nucleic acid encoding the antibody. In a further aspect, theinvention provides a method of producing an antibody comprisingculturing the host cell so that the antibody is produced.

In another aspect, the invention provides an immunoconjugate comprisingan antibody of any of the above embodiments and a cytotoxic agent.

In another aspect, the invention provides a pharmaceutical formulationcomprising an antibody of any of the above embodiments and apharmaceutically acceptable carrier.

In another aspect, an antibody of any of the above embodiments isprovided for use as a medicament. In some embodiments, an antibody ofany of the above embodiments is provided for use in treating a cancer.In some embodiments, an antibody of any of the above embodiments isprovided for use in reducing cancer cell growth.

In another aspect, a method of inhibiting Jagged1-mediated signaling isprovided. In one embodiment, a method of inhibiting Jagged1-mediatedsignaling in vitro is provided. In one embodiment, a method ofinhibiting Jagged1-mediated signaling in vivo is provided.

In another aspect, a method of treating an individual having a cancercomprising administering to the individual an effective amount of anantibody of any of the above embodiments. In one embodiment, the canceris selected from the group consisting of: breast cancer, lung cancer,brain cancer, cervical cancer, colon cancer, liver cancer, bile ductcancer, pancreatic cancer, skin cancer, B-cell malignancies, and T-cellmalignancies.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows exemplary amino acid sequences of human and murine Jagged1protein.

FIG. 2 shows exemplary amino acid sequences of human and murine Jagged2protein.

FIGS. 3A-D show the amino acid sequences of peptides used for phageantibody library screening and selection. All proteins were expressed asa secreted protein in BEVS cells and their sequences are listed in theN-terminal to C-terminal direction. (A) Amino acid sequence of expressedprotein murine Jagged 1-DSL-EGF1-4 (Q34-D377). The bold font at theN-terminus represents a short linker sequence (ADLGS) (SEQ ID NO: 31).The bold font at the C-terminus represents a short linker sequence(EFG), a thrombin cleavage site (LVPRGS) (SEQ ID NO: 137), a G spacerand the 6-His tag (SEQ ID NO: 138). (B) Amino acid sequence of expressedprotein human Jag1-DSL-EGF1-4. Only the Jag1 sequence is shown althoughthe antigen also contained a TEV protease cleavage site and 6-His tag(SEQ ID NO: 138) at the C-terminus. (C) Amino acid sequence of expressedprotein murine Jag2-DSL-EGF1-4 (M27-E388). The bold font at theN-terminus represents a short linker sequence (ADLGS) (SEQ ID NO: 31).The bold font at the C-terminus represents a short linker sequence(EFG), a thrombin cleavage site (LVPRGS) (SEQ ID NO: 137), a G spacerand the 6-His tag (SEQ ID NO: 138). (D) Amino acid sequence of expressedprotein human Jag2-DSL-EGF1-4 (R2-E388). The bold font at the C-terminusrepresents a short linker sequence (EFG), a thrombin cleavage site(LVPRGS) (SEQ ID NO: 137), a G spacer and the 6-His tag (SEQ ID NO:138).

FIGS. 4A-1-B-2 show an alignment of the amino acid sequences for theheavy (FIG. 4A-1 and FIG. 4A-2) and light (FIG. 4B-1 and FIG. 4B-2)chain variable domains of anti-Jagged antibodies (Example 1-2). Aminoacid positions of the complementarity determining regions (CDRs) areindicated.

FIGS. 5A-B show exemplary acceptor human variable heavy (VH) consensusframework sequences for use in practicing the instant invention.Sequence identifiers are as follows:

-   -   human VH subgroup I consensus framework “A” minus Kabat CDRs        (SEQ ID NOs:32, 33, 34, 35).    -   human VH subgroup I consensus frameworks “B,” “C,” and “D” minus        extended hypervariable regions (SEQ ID NOs:36, 37, 34, 35; SEQ        ID NOs:36, 37, 38, 35; and SEQ ID NOs:36, 37, 39, 35).    -   human VH subgroup II consensus framework “A” minus Kabat CDRs        (SEQ ID NOs:40, 41, 42, 35).    -   human VH subgroup II consensus frameworks “B,” “C,” and “D”        minus extended hypervariable regions (SEQ ID NOs:43, 44, 42, 35;        SEQ ID NOs:43, 44, 45, 35; and SEQ ID NOs:43, 44, 46, and 35).    -   human VH subgroup III consensus framework “A” minus Kabat CDRs        (SEQ ID NOs:47, 48, 49, 35).    -   human VH subgroup III consensus frameworks “B,” “C,” and “D”        minus extended hypervariable regions (SEQ ID NOs:50, 51, 49, 35;        SEQ ID NOs:50, 51, 52, 35; and SEQ ID NOs:50, 51, 53, 35).    -   human VH acceptor framework “A” minus Kabat CDRs (SEQ ID NOs:54,        48, 55, 35).    -   human VH acceptor frameworks “B” and “C” minus extended        hypervariable regions (SEQ ID NOs:50, 51, 55, 35; and SEQ ID        NOs:50, 51, 56, 35).    -   human VH acceptor 2 framework “A” minus Kabat CDRs (SEQ ID        NOs:54, 48, 57, 35).    -   human VH acceptor 2 framework “B,” “C,” and “D” minus extended        hypervariable regions (SEQ ID NOs:50, 51, 57, 35; SEQ ID NOs:50,        51, 58, 35; and SEQ ID NOs:50, 51, 59, 35).

FIG. 6 shows exemplary acceptor human variable light (VL) consensusframework sequences for use in practicing the instant invention.Sequence identifiers are as follows:

-   -   human VL kappa subgroup I consensus framework (κv1): SEQ ID        NOs:60, 61, 62, 63    -   human VL kappa subgroup II consensus framework (κv2): SEQ ID        NOs:64, 65, 66, 63    -   human VL kappa subgroup III consensus framework (κv3): SEQ ID        NOs:67, 68, 69, 63    -   human VL kappa subgroup IV consensus framework (κv4): SEQ ID        NOs:70, 71, 72, 63.

FIGS. 7A-F show the H1, H2, and H3 heavy chain hypervariable region(HVR) sequences of anti-Jagged antibodies, as described in the Examples.Amino acid positions are numbered according to the Kabat numberingsystem as described below.

FIGS. 8A-E show the L1, L2, and L3 light chain HVR sequences ofanti-Jagged antibodies, as described in the Examples. Amino acidpositions are numbered according to the Kabat numbering system asdescribed below.

FIG. 9 shows light and heavy chain framework sequences of anti-Jaggedantibodies described in the Examples. Numbers in superscript indicateamino acid positions according to Kabat.

FIGS. 10A-B show binding specificity of antibodies obtained from thefirst (FIG. 10A) and second (FIG. 10B) round of screening. (A) Resultsof ELISA assays measuring binding of antibody D-1 (left panel) and C-1(right panel) to human Jagged1 (hJag-1), human Jagged2 (hJag-2), murineJagged2 (mJag-2), human Delta-like 1 (hDLL-1), murine Delta-like 1(mDLL-1), or human Delta-like 4 (hDLL-4). Antibody concentrations areindicated on the x-axis and OD650 on the y-axis. (B) Results of ELISAassays measuring binding specificity of Antibodies A and B, bothidentified during further screening using human Jag1-DSL-EGF1-4 (FIG.3B) for antibody A and murine and human Jag2-DSL-EGF1-4 (FIGS. 3C and D)for antibody B. Black columns=binding to human Jagged1; graycolumns=binding to human Jagged2. C-1 served as a control for binding toboth Jagged1 and Jagged2.

FIG. 11 shows binding constants for antibodies A, A-1, A-2, B, B-1, B-2,B-3, C, C-1, D, D-1, and D-2 binding to purified human Jagged1 (humanJag1), human Jagged2 (human Jag2), and mouse Jagged2 (mouse Jag2).

FIG. 12 shows dose-dependent inhibition of Jagged1-induced signaling ofNotch 1 by anti-Jagged antibodies. Results were obtained from co-cultureexperiments that measure Jagged1-induced signaling through the Notch1receptor, as described in Example 4. The y-axis indicates expressionlevels of the Notch-dependent reporter gene firefly luciferase relativeto expression of a control gene (constitutively active promoter drivingexpression of Renilla luciferase). The x-axis indicates concentrationsfor antibodies D and C (0.4-50 μg/ml). Co-culture without antibodies (J1induced-positive control) served as positive control for Jagged1-inducedsignaling. An isotype control antibody served as control for specificantibody inhibition. A gamma secretase inhibitor (Compound E+) was usedas control for inhibition of Notch signaling.

FIGS. 13A-B show inhibition of Notch signaling by affinity maturedanti-Jagged antibodies. Co-culture assays were performed as described inFIG. 12 and Example 4. (A) Phage antibodies and their concentrations(μg/me are indicated on the x-axis (parental antibodies C and D servedas control). The gamma-secretase inhibitors (GSIs) Compound E (CmpE) andN—[N-(3,5-Difluorophenacetyl)-L-alanyl]-S-phenylglycine t-butyl ester(DAPT) at the indicated concentrations served as positive control forinhibition of Notch signaling; DMSO served as vehicle control for theGSIs; an irrelevant antibody with the same isotype as those tested inthe panel served as isotype control. (B) Phage antibodies at theindicated concentration are indicated on the x-axis. DAPT at theindicated concentrations served as positive control for inhibition ofNotch signaling; DMSO served as vehicle control. Signaling was inducedby Jagged1 (dark gray columns) or by Jagged2 (light gray columns).Untreated=cultures that were not stimulated with ligand and not treatedwith antibody; No Stimulation or 3T3P=cultures not stimulated withligand; agD or gD=isotype control antibody; Stim/no AB or No Ab=culturesstimulated with ligand but not treated with antibody; gamma-secretaseinhibitor DAPT or the DAPT vehicle control of DMSO.

FIGS. 14A-B show that combined inhibition of Jagged1 and Jagged2 causesrapid weight loss. (A) Mice were dosed twice per week with theanti-Jagged1/2 antibody C-1 (anti-J1/2; 5-10 mpk), the anti-Jagged1antibody A-2 (anti-J1; 5-20mpk), the anti-Jagged2 antibody B-3 (anti-J2;5-20mpk), the antibody A-2 and B-3 together (anti-J1 & -2; 5mpk each) oran isotype control antibody (20mpk). Total antibody concentration ofeach dosing was brought up to 20mpk with the isotype control antibody,where necessary. The average body weight changes (y-axis) are graphed asa percentage of starting body weight over time (x-axis). (B) Balb/c mice(ten per group, individually housed) were injected IP twice per weekwith either 30 mpk of anti-gD isotype control antibody or with acombination of 15 mpk antibody A-2 plus 15 mpk antibody B-3 for eightdays. Food intake was assessed by daily weighing of the food deliveredand remaining in each cage. Error bars represent standard deviations(n=10).

FIGS. 15A-B show normal intestinal histology of following anti-Jaggedantibody treatment. (A) Intestinal samples of mice treated as describedin Example 6 were isolated and stained with hematoxylin and eosin (FIG.15A, H & E) or with Alcian Blue (FIG. 15A, Alcian Blue). (B) Sections ofintestine samples were stained with primary antibodies to eitherlysozyme or Ki-67 (FIG. 15B)

FIGS. 16A-1-B-2 show inhibition of human lung cancer cell growth by ananti-Jagged1 antagonist antibody in vivo. Mice bearing human lung cancerxenografts were injected twice per week intraperitoneally (IP) with20mpk anti-gD isotype control antibody (Isotype control Ab) or withanti-Jagged1 antibody A-2 (Anti-Jag1), with the injections startingafter average tumor volumes (measured with calipers) reachedapproximately 180 mm³ Tumor volumes (y-axis) were subsequently measuredfor 19 days. FIG. 16A-1 and FIG. 16A-2: The average tumor volumes foreach group (n=10) were plotted over time (x-axis) using a linear mixedeffects model (FIG. 16A-1). Tumor volumes for each mouse in each groupare depicted in the two panels in FIG. 16A-2. FIG. 16B-1 and FIG. 16B-2:Total body weight of each mouse was measured and graphed as thepercentage change averaged for each group (FIG. 16B-1) or for each mousein each group (FIG. 16B-2).

FIGS. 17A-B show inhibition of human breast cancer cell growth byanti-Jagged1 and anti-Jagged2 antagonist antibodies in vivo. C.B-17SCID.bg mice with human breast cancer xenografts were injected on days0, 4, 7, 12, 15, 18, 22, 25, 29, 32, 36, 43, 50, and 57 with anti-gDisotype control antibody (Anti-gD), anti-ragweed isotype controlantibody (anti-ragweed), anti-Jagged1 antibody A-2 in the human IgG1backbone (anti-Jag1 A-2 (hIgG1)), anti-Jagged1 antibody A-2 in themurine IgG2a backbone (anti-Jag1 A-2 (mIgG2a)), or anti-Jagged2 antibodyB-3 in the human IgG1 backbone (anti-Jag2 B-3 (hIgG1)). Tumor volumes(y-axis) of treatment groups (A) or individual animals (B) were plottedusing a linear mixed effects model over time (x-axis).

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION I. Definitions

An “acceptor human framework” for the purposes herein is a frameworkcomprising the amino acid sequence of a light chain variable domain (VL)framework or a heavy chain variable domain (VH) framework derived from ahuman immunoglobulin framework or a human consensus framework, asdefined below. An acceptor human framework “derived from” a humanimmunoglobulin framework or a human consensus framework may comprise thesame amino acid sequence thereof, or it may contain amino acid sequencechanges. In some embodiments, the number of amino acid changes are 10 orless, 9 or less, 8 or less, 7 or less, 6 or less, 5 or less, 4 or less,3 or less, or 2 or less. In some embodiments, the VL acceptor humanframework is identical in sequence to the VL human immunoglobulinframework sequence or human consensus framework sequence.

“Affinity” refers to the strength of the sum total of noncovalentinteractions between a single binding site of a molecule (e.g., anantibody) and its binding partner (e.g., an antigen). Unless indicatedotherwise, as used herein, “binding affinity” refers to intrinsicbinding affinity which reflects a 1:1 interaction between members of abinding pair (e.g., antibody and antigen). The affinity of a molecule Xfor its partner Y can generally be represented by the dissociationconstant (Kd). Affinity can be measured by common methods known in theart, including those described herein. Specific illustrative andexemplary embodiments for measuring binding affinity are described inthe following.

An “affinity matured” antibody refers to an antibody with one or morealterations in one or more hypervariable regions (HVRs), compared to aparent antibody which does not possess such alterations, suchalterations resulting in an improvement in the affinity of the antibodyfor antigen.

The terms “anti-Jagged antibody” and “an antibody that binds to Jagged”refer to an antibody that is capable of binding Jagged1, Jagged2, orJagged1 and 2 (Jagged1/2) with sufficient affinity such that theantibody is useful as a diagnostic and/or therapeutic agent in targetingJagged. In one embodiment, the extent of binding of an anti-Jaggedantibody to an unrelated, non-Jagged protein is less than about 10% ofthe binding of the antibody to Jagged as measured, e.g., by aradioimmunoassay (RIA). In certain embodiments, an antibody that bindsto Jagged has a dissociation constant (Kd) of ≦1 μM, ≦100 nM, ≦10 nM, ≦1nM, ≦0.1 nM, ≦0.01 nM, or ≦0.001 nM (e.g. 10⁻⁸M or less, e.g. from 10⁻⁸Mto 10⁻¹³M, e.g., from 10⁻⁹ M to 10⁻¹³ M). In certain embodiments, ananti-Jagged antibody binds to an epitope of Jagged that is conservedamong Jagged from different species.

The term “antibody” herein is used in the broadest sense and encompassesvarious antibody structures, including but not limited to monoclonalantibodies, polyclonal antibodies, multispecific antibodies (e.g.,bispecific antibodies), and antibody fragments so long as they exhibitthe desired antigen-binding activity.

A “blocking” antibody or an “antagonist” antibody is one whichsignificantly inhibits (either partially or completely) a biologicalactivity of the antigen it binds.

An “antibody fragment” refers to a molecule other than an intactantibody that comprises a portion of an intact antibody that binds theantigen to which the intact antibody binds. Examples of antibodyfragments include but are not limited to Fv, Fab, Fab′, Fab′-SH,F(ab′)₂; diabodies; linear antibodies; single-chain antibody molecules(e.g. scFv); and multispecific antibodies formed from antibodyfragments.

An “antibody that binds to the same epitope” as a reference antibodyrefers to an antibody that blocks binding of the reference antibody toits antigen in a competition assay by 50% or more, and conversely, thereference antibody blocks binding of the antibody to its antigen in acompetition assay by 50% or more. An exemplary competition assay isprovided herein.

The term “chimeric” antibody refers to an antibody in which a portion ofthe heavy and/or light chain is derived from a particular source orspecies, while the remainder of the heavy and/or light chain is derivedfrom a different source or species.

The “class” of an antibody refers to the type of constant domain orconstant region possessed by its heavy chain. There are five majorclasses of antibodies: IgA, IgD, IgE, IgG, and IgM, and several of thesemay be further divided into subclasses (isotypes), e.g., IgG₁, IgG₂,IgG₃, IgG₄, IgA₁, and IgA₂. The heavy chain constant domains thatcorrespond to the different classes of immunoglobulins are called α, δ,ε, γ, and μ, respectively.

The term “cytotoxic agent” as used herein refers to a substance thatinhibits or prevents a cellular function and/or causes cell death ordestruction. Cytotoxic agents include, but are not limited to,radioactive isotopes (e.g., At²¹¹, I¹³¹, I¹²⁵, Y⁹⁰, Re¹⁸⁶, Re¹⁸⁸, sm¹⁵³,Bi²¹², P³², Pb²¹² and radioactive isotopes of Lu); chemotherapeuticagents or drugs (e.g., methotrexate, adriamicin, vinca alkaloids(vincristine, vinblastine, etoposide), doxorubicin, melphalan, mitomycinC, chlorambucil, daunorubicin or other intercalating agents); growthinhibitory agents; enzymes and fragments thereof such as nucleolyticenzymes; antibiotics; toxins such as small molecule toxins orenzymatically active toxins of bacterial, fungal, plant or animalorigin, including fragments and/or variants thereof; and the variousantitumor or anticancer agents disclosed below.

“Effector functions” refer to those biological activities attributableto the Fc region of an antibody, which vary with the antibody isotype.Examples of antibody effector functions include: C1q binding andcomplement dependent cytotoxicity (CDC); Fc receptor binding;antibody-dependent cell-mediated cytotoxicity (ADCC); phagocytosis; downregulation of cell surface receptors (e.g. B cell receptor); and B cellactivation.

An “effective amount” of an agent, e.g., a pharmaceutical formulation,refers to an amount effective, at dosages and for periods of timenecessary, to achieve the desired therapeutic or prophylactic result.

The term “Fc region” herein is used to define a C-terminal region of animmunoglobulin heavy chain that contains at least a portion of theconstant region. The term includes native sequence Fc regions andvariant Fc regions. In one embodiment, a human IgG heavy chain Fc regionextends from Cys226, or from Pro230, to the carboxyl-terminus of theheavy chain. However, the C-terminal lysine (Lys447) of the Fc regionmay or may not be present. Unless otherwise specified herein, numberingof amino acid residues in the Fc region or constant region is accordingto the EU numbering system, also called the EU index, as described inKabat et al., Sequences of Proteins of Immunological Interest, 5th Ed.Public Health Service, National Institutes of Health, Bethesda, Md.,1991.

“Framework” or “FR” refers to variable domain residues other thanhypervariable region (HVR) residues. The FR of a variable domaingenerally consists of four FR domains: FR1, FR2, FR3, and FR4.Accordingly, the HVR and FR sequences generally appear in the followingsequence in VH (or VL): FR1-H1 (L1)-FR2-H2(L2)-FR3-H3(L3)-FR4.

The terms “full length antibody,” “intact antibody,” and “wholeantibody” are used herein interchangeably to refer to an antibody havinga structure substantially similar to a native antibody structure orhaving heavy chains that contain an Fc region as defined herein.

The terms “host cell,” “host cell line,” and “host cell culture” areused interchangeably and refer to cells into which exogenous nucleicacid has been introduced, including the progeny of such cells. Hostcells include “transformants” and “transformed cells,” which include theprimary transformed cell and progeny derived therefrom without regard tothe number of passages. Progeny may not be completely identical innucleic acid content to a parent cell, but may contain mutations. Mutantprogeny that have the same function or biological activity as screenedor selected for in the originally transformed cell are included herein.

A “human antibody” is one which possesses an amino acid sequence whichcorresponds to that of an antibody produced by a human or a human cellor derived from a non-human source that utilizes human antibodyrepertoires or other human antibody-encoding sequences. This definitionof a human antibody specifically excludes a humanized antibodycomprising non-human antigen-binding residues.

A “human consensus framework” is a framework which represents the mostcommonly occurring amino acid residues in a selection of humanimmunoglobulin VL or VH framework sequences. Generally, the selection ofhuman immunoglobulin VL or VH sequences is from a subgroup of variabledomain sequences. Generally, the subgroup of sequences is a subgroup asin Kabat et al., Sequences of Proteins of Immunological Interest, FifthEdition, NIH Publication 91-3242, Bethesda Md. (1991), vols. 1-3. In oneembodiment, for the VL, the subgroup is subgroup kappa I as in Kabat etal., supra. In one embodiment, for the VH, the subgroup is subgroup IIIas in Kabat et al., supra.

A “humanized” antibody refers to a chimeric antibody comprising aminoacid residues from non-human HVRs and amino acid residues from humanFRs. In certain embodiments, a humanized antibody will comprisesubstantially all of at least one, and typically two, variable domains,in which all or substantially all of the HVRs (e.g., CDRs) correspond tothose of a non-human antibody, and all or substantially all of the FRscorrespond to those of a human antibody. A humanized antibody optionallymay comprise at least a portion of an antibody constant region derivedfrom a human antibody. A “humanized form” of an antibody, e.g., anon-human antibody, refers to an antibody that has undergonehumanization.

The term “hypervariable region” or “HVR” as used herein refers to eachof the regions of an antibody variable domain which are hypervariable insequence (“complementarity determining regions” or “CDRs”) and/or formstructurally defined loops (“hypervariable loops”) and/or contain theantigen-contacting residues (“antigen contacts”). Generally, antibodiescomprise six HVRs: three in the VH (H1, H2, H3), and three in the VL(L1, L2, L3). Exemplary HVRs herein include:

(a) hypervariable loops occurring at amino acid residues 26-32 (L1),50-52 (L2), 91-96 (L3), 26-32 (H1), 53-55 (H2), and 96-101 (H3) (Chothiaand Lesk, J. Mol. Biol. 196:901-917 (1987));

(b) CDRs occurring at amino acid residues 24-34 (L1), 50-56 (L2), 89-97(L3), 31-35b (H1), 50-65 (H2), and 95-102 (H3) (Kabat et al., Sequencesof Proteins of Immunological Interest, 5th Ed. Public Health Service,National Institutes of Health, Bethesda, Md. (1991));

(c) antigen contacts occurring at amino acid residues 27c-36 (L1), 46-55(L2), 89-96 (L3), 30-35b (H1), 47-58 (H2), and 93-101 (H3) (MacCallum etal. J. Mol. Biol. 262: 732-745 (1996)); and

(d) combinations of (a), (b), and/or (c), including HVR amino acidresidues 46-56 (L2), 47-56 (L2), 48-56 (L2), 49-56 (L2), 26-35 (H1),26-35b (H1), 49-65 (H2), 93-102 (H3), and 94-102 (H3).

Unless otherwise indicated, HVR residues and other residues in thevariable domain (e.g., FR residues) are numbered herein according toKabat et al., supra.

An “immunoconjugate” is an antibody conjugated to one or moreheterologous molecule(s), including but not limited to a cytotoxicagent.

An “individual” or “subject” is a mammal Mammals include, but are notlimited to, domesticated animals (e.g., cows, sheep, cats, dogs, andhorses), primates (e.g., humans and non-human primates such as monkeys),rabbits, and rodents (e.g., mice and rats). In certain embodiments, theindividual or subject is a human.

An “isolated” antibody is one which has been separated from a componentof its natural environment. In some embodiments, an antibody is purifiedto greater than 95% or 99% purity as determined by, for example,electrophoretic (e.g., SDS-PAGE, isoelectric focusing (IEF), capillaryelectrophoresis) or chromatographic (e.g., ion exchange or reverse phaseHPLC). For review of methods for assessment of antibody purity, see,e.g., Flatman et al., J. Chromatogr. B 848:79-87 (2007).

An “isolated” nucleic acid refers to a nucleic acid molecule that hasbeen separated from a component of its natural environment. An isolatednucleic acid includes a nucleic acid molecule contained in cells thatordinarily contain the nucleic acid molecule, but the nucleic acidmolecule is present extrachromosomally or at a chromosomal location thatis different from its natural chromosomal location.

“Isolated nucleic acid encoding an anti-Jagged antibody” refers to oneor more nucleic acid molecules encoding antibody heavy and light chains(or fragments thereof), including such nucleic acid molecule(s) in asingle vector or separate vectors, and such nucleic acid molecule(s)present at one or more locations in a host cell.

The term “monoclonal antibody” as used herein refers to an antibodyobtained from a population of substantially homogeneous antibodies,i.e., the individual antibodies comprising the population are identicaland/or bind the same epitope, except for possible variant antibodies,e.g., containing naturally occurring mutations or arising duringproduction of a monoclonal antibody preparation, such variants generallybeing present in minor amounts. In contrast to polyclonal antibodypreparations, which typically include different antibodies directedagainst different determinants (epitopes), each monoclonal antibody of amonoclonal antibody preparation is directed against a single determinanton an antigen. Thus, the modifier “monoclonal” indicates the characterof the antibody as being obtained from a substantially homogeneouspopulation of antibodies, and is not to be construed as requiringproduction of the antibody by any particular method. For example, themonoclonal antibodies to be used in accordance with the presentinvention may be made by a variety of techniques, including but notlimited to the hybridoma method, recombinant DNA methods, phage-displaymethods, and methods utilizing transgenic animals containing all or partof the human immunoglobulin loci, such methods and other exemplarymethods for making monoclonal antibodies being described herein.

A “naked antibody” refers to an antibody that is not conjugated to aheterologous moiety (e.g., a cytotoxic moiety) or radiolabel. The nakedantibody may be present in a pharmaceutical formulation.

“Native antibodies” refer to naturally occurring immunoglobulinmolecules with varying structures. For example, native IgG antibodiesare heterotetrameric glycoproteins of about 150,000 daltons, composed oftwo identical light chains and two identical heavy chains that aredisulfide-bonded. From N- to C-terminus, each heavy chain has a variableregion (VH), also called a variable heavy domain or a heavy chainvariable domain, followed by three constant domains (CH1, CH2, and CH3).Similarly, from N- to C-terminus, each light chain has a variable region(VL), also called a variable light domain or a light chain variabledomain, followed by a constant light (CL) domain. The light chain of anantibody may be assigned to one of two types, called kappa (κ) andlambda (λ), based on the amino acid sequence of its constant domain.

The term “package insert” is used to refer to instructions customarilyincluded in commercial packages of therapeutic products, that containinformation about the indications, usage, dosage, administration,combination therapy, contraindications and/or warnings concerning theuse of such therapeutic products.

“Percent (%) amino acid sequence identity” with respect to a referencepolypeptide sequence is defined as the percentage of amino acid residuesin a candidate sequence that are identical with the amino acid residuesin the reference polypeptide sequence, after aligning the sequences andintroducing gaps, if necessary, to achieve the maximum percent sequenceidentity, and not considering any conservative substitutions as part ofthe sequence identity. Alignment for purposes of determining percentamino acid sequence identity can be achieved in various ways that arewithin the skill in the art, for instance, using publicly availablecomputer software such as BLAST, BLAST-2, ALIGN or Megalign (DNASTAR)software. Those skilled in the art can determine appropriate parametersfor aligning sequences, including any algorithms needed to achievemaximal alignment over the full length of the sequences being compared.For purposes herein, however, % amino acid sequence identity values aregenerated using the sequence comparison computer program ALIGN-2. TheALIGN-2 sequence comparison computer program was authored by Genentech,Inc., and the source code has been filed with user documentation in theU.S. Copyright Office, Washington D.C., 20559, where it is registeredunder U.S. Copyright Registration No. TXU510087. The ALIGN-2 program ispublicly available from Genentech, Inc., South San Francisco, Calif., ormay be compiled from the source code. The ALIGN-2 program should becompiled for use on a UNIX operating system, including digital UNIXV4.0D. All sequence comparison parameters are set by the ALIGN-2 programand do not vary.

In situations where ALIGN-2 is employed for amino acid sequencecomparisons, the % amino acid sequence identity of a given amino acidsequence A to, with, or against a given amino acid sequence B (which canalternatively be phrased as a given amino acid sequence A that has orcomprises a certain % amino acid sequence identity to, with, or againsta given amino acid sequence B) is calculated as follows:

100 times the fraction X/Y

where X is the number of amino acid residues scored as identical matchesby the sequence alignment program ALIGN-2 in that program's alignment ofA and B, and where Y is the total number of amino acid residues in B. Itwill be appreciated that where the length of amino acid sequence A isnot equal to the length of amino acid sequence B, the % amino acidsequence identity of A to B will not equal the % amino acid sequenceidentity of B to A. Unless specifically stated otherwise, all % aminoacid sequence identity values used herein are obtained as described inthe immediately preceding paragraph using the ALIGN-2 computer program.

The term “pharmaceutical formulation” refers to a preparation which isin such form as to permit the biological activity of an activeingredient contained therein to be effective, and which contains noadditional components which are unacceptably toxic to a subject to whichthe formulation would be administered.

A “pharmaceutically acceptable carrier” refers to an ingredient in apharmaceutical formulation, other than an active ingredient, which isnontoxic to a subject. A pharmaceutically acceptable carrier includes,but is not limited to, a buffer, excipient, stabilizer, or preservative.

The term “Jagged” or “Jag,” as used herein, refers to any native Jaggedfrom any vertebrate source, including mammals such as primates (e.g.humans) and rodents (e.g., mice and rats), unless otherwise indicated.The term encompasses “full-length,” unprocessed Jagged as well as anyform of Jagged that results from processing in the cell. The term alsoencompasses naturally occurring variants of Jagged, e.g., splicevariants or allelic variants. The amino acid sequence of an exemplaryhuman and murine Jagged1 and Jagged2 is shown in FIGS. 1 and 2 (SEQ IDNOS:1-4), respectively.

As used herein, “treatment” (and grammatical variations thereof such as“treat” or “treating”) refers to clinical intervention in an attempt toalter the natural course of the individual being treated, and can beperformed either for prophylaxis or during the course of clinicalpathology. Desirable effects of treatment include, but are not limitedto, preventing occurrence or recurrence of disease, alleviation ofsymptoms, diminishment of any direct or indirect pathologicalconsequences of the disease, preventing metastasis, decreasing the rateof disease progression, amelioration or palliation of the disease state,and remission or improved prognosis. In some embodiments, antibodies ofthe invention are used to delay development of a disease or to slow theprogression of a disease.

The term “variable region” or “variable domain” refers to the domain ofan antibody heavy or light chain that is involved in binding theantibody to antigen. The variable domains of the heavy chain and lightchain (VH and VL, respectively) of a native antibody generally havesimilar structures, with each domain comprising four conserved frameworkregions (FRs) and three hypervariable regions (HVRs). (See, e.g., Kindtet al. Kuby Immunology, 6^(th) ed., W.H. Freeman and Co., page 91(2007).) A single VH or VL domain may be sufficient to conferantigen-binding specificity. Furthermore, antibodies that bind aparticular antigen may be isolated using a VH or VL domain from anantibody that binds the antigen to screen a library of complementary VLor VH domains, respectively. See, e.g., Portolano et al., J. Immunol.150:880-887 (1993); Clarkson et al., Nature 352:624-628 (1991).

The term “vector,” as used herein, refers to a nucleic acid moleculecapable of propagating another nucleic acid to which it is linked. Theterm includes the vector as a self-replicating nucleic acid structure aswell as the vector incorporated into the genome of a host cell intowhich it has been introduced. Certain vectors are capable of directingthe expression of nucleic acids to which they are operatively linked.Such vectors are referred to herein as “expression vectors.”

II. Compositions and Methods

In one aspect, the invention is based, in part, on the identification ofanti-Jagged antibodies and fragments thereof. In certain embodiments,antibodies that bind to at least one Jagged are provided. Antibodies ofthe invention are useful, e.g., for the diagnosis or treatment ofcancer. Accordingly, the invention provides methods, compositions, kits,and articles of manufacture related to anti-Jagged antibodies.

A. Exemplary Anti-Jagged Antibodies

In one aspect, the invention provides isolated antibodies that bind toJagged. In certain embodiments, the anti-Jagged antibody is ananti-Jagged1 antibody.

In one aspect, the invention provides an anti-Jagged1 antibodycomprising at least one, two, three, four, five, or six HVRs selectedfrom:

(a) HVR-H1 comprising the amino acid sequence of SEQ ID NO:81;

(b) HVR-H2 comprising an amino acid sequence of SEQ ID NO:84;

(c) HVR-H3 comprising an amino acid sequence of SEQ ID NO:87;

(d) HVR-L1 comprising the amino acid sequence of SEQ ID NO:110;

(e) HVR-L2 comprising the amino acid sequence of SEQ ID NO:111; and

(f) HVR-L3 comprising an amino acid sequence of SEQ ID NO:114.

In a further aspect, the anti-Jagged1 antibody comprises an HVR-H1comprising the amino acid sequence of SEQ ID NO:81 and at least one,two, three, four, or five HVRs selected from (b), (c), (d), (e) and (f)above. In one embodiment, the antibody comprises (a), (b), (c), (d), (e)and (f) above, wherein with respect to (b) (c), and (f) any one or moreof the following embodiments are contemplated: HVR-H2 comprises an aminoacid sequence selected from SEQ ID NOs: 82-83; HVR-H3 comprises an aminoacid sequence selected from SEQ ID NOs: 85-86; and HVR-L3 comprises anamino acid sequence selected from SEQ ID NOs: 112-113.

In another embodiment, an antibody that specifically binds to Jagged1 isprovided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:81;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:82;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:85;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:110;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:111; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:112.

In another embodiment, an antibody that specifically binds to Jagged1 isprovided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:81;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:82;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:86;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:110;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:111; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:113.

In another embodiment, an antibody that specifically binds to Jagged1 isprovided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:81;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:83;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:85;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:110;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:111; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:112.

In certain embodiments, the anti-Jagged antibody is an anti-Jagged2antibody.

In one aspect, the invention provides an anti-Jagged2 antibodycomprising at least one, two, three, four, five, or six HVRs selectedfrom:

(a) HVR-H1 comprising the amino acid sequence of SEQ ID NO:88;

(b) HVR-H2 comprising the amino acid sequence of SEQ ID NO:89;

(c) HVR-H3 comprising an amino acid sequence of SEQ ID NO:94;

(d) HVR-L1 comprising the amino acid sequence of SEQ ID NO:115;

(e) HVR-L2 comprising the amino acid sequence of SEQ ID NO:116; and

(f) HVR-L3 comprising an amino acid sequence of SEQ ID NO:122.

In a further aspect, the anti-Jagged2 antibody comprises an HVR-H1comprising the amino acid sequence of SEQ ID NO:88 and at least one,two, three, four, or five HVRs selected from (b), (c), (d), (e) and (f)above. In one embodiment, the antibody comprises (a), (b), (c), (d), (e)and (f) above, wherein with respect to (c) and (f) any one or more ofthe following embodiments are contemplated: HVR-H3 comprises an aminoacid sequence selected from SEQ ID NOs:90-93; and HVR-L3 comprises anamino acid sequence selected from SEQ ID NOs:117-121.

In one embodiment, an antibody that specifically binds to Jagged2 isprovided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:88;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:89;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:90;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:115;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:116; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:117.

In another embodiment, an antibody that specifically binds to Jagged2 isprovided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:88;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:89;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:91;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:115;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:116; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:118.

In another embodiment, an antibody that specifically binds to Jagged2 isprovided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:88;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:89;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:90;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:115;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:116; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:119.

In another embodiment, an antibody that specifically binds to Jagged2 isprovided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:88;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:89;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:92;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:115;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:116; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:120.

In another embodiment, an antibody that specifically binds to Jagged2 isprovided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:88;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:89;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:93;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:115;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:116; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:121.

In certain embodiments, the anti-Jagged antibody is an anti-Jagged1/2antibody.

In one aspect, the invention provides an anti-Jagged1/2 antibodycomprising at least one, two, three, four, five, or six HVRs selectedfrom an HVR-H1 comprising the amino acid sequence of SEQ ID NO:95;HVR-H2 comprising the amino acid sequence of SEQ ID NO:96; HVR-H3comprising an amino acid sequence of SEQ ID NO:99; HVR-L1 comprising theamino acid sequence of SEQ ID NO:123; HVR-L2 comprising the amino acidsequence of SEQ ID NO:124; and HVR-L3 comprising an amino acid sequenceof SEQ ID NO:127.

In one embodiment, an antibody that specifically binds to Jagged1/2 isprovided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:95;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:96;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:97;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:123;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:124; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:125.

In one embodiment, an antibody that specifically binds to Jagged1/2 isprovided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:95;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:96;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:98;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:123;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:124; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:126.

In another aspect, the invention provides an anti-Jagged1/2 antibodycomprising at least one, two, three, four, five, or six HVRs selectedfrom an HVR-H1 comprising an amino acid sequence of SEQ ID NO:105;HVR-H2 comprising the amino acid sequence of SEQ ID NO:106; HVR-H3comprising an amino acid sequence of SEQ ID N0:109; HVR-L1 comprisingthe amino acid sequence of SEQ ID NO:128; HVR-L2 comprising the aminoacid sequence of SEQ ID NO:129; and HVR-L3 comprising an amino acidsequence of SEQ ID NO:134.

In another embodiment, an antibody that specifically binds to Jagged1/2is provided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:100;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:106;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:107;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:128;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:129; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:130.

In another embodiment, an antibody that specifically binds to Jagged1/2is provided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:100;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:106;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:108;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:128;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:129; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:131.

In another embodiment, an antibody that specifically binds to Jagged1/2is provided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:101;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:106;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:107;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:128;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:129; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:132.

In another embodiment, an antibody that specifically binds to Jagged1/2is provided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:102;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:106;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:107;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:128;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:129; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:133.

In another embodiment, an antibody that specifically binds to Jagged1/2is provided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:103;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:106;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:107;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:128;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:129; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:132.

In another embodiment, an antibody that specifically binds to Jagged1/2is provided, wherein the antibody comprises:

(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:104;

(b) an HVR-H2 comprising the amino acid sequence of SEQ ID NO:106;

(c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:107;

(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:128;

(e) an HVR-L2 comprising the amino acid sequence of SEQ ID NO:129; and

(f) an HVR-L3 comprising the amino acid sequence of SEQ ID NO:132.

In any of the above embodiments, an anti-Jagged antibody is humanized.In one embodiment, an anti-Jagged antibody comprises HVRs as in any ofthe above embodiments, and further comprises an acceptor humanframework, e.g. a human immunoglobulin framework or a human consensusframework. In another embodiment, an anti-Jagged antibody comprises HVRsas in any of the above embodiments, and further comprises a VHcomprising at least one, two, three, or four FRs selected from an FR1comprising the amino acid sequence of SEQ ID NO:32, 36, 40, 43, 47, 50,or 54; an FR2 comprising the amino acid sequence of SEQ ID NO:33, 37,41, 44, 48, 51 or 136; an FR3 comprising the amino acid sequence of SEQID NO:34, 38, 39, 42, 45, 46, 49, 52, 53, 55, 56, 57, 58, 59; and an FR4comprising the amino acid sequence of SEQ ID NO:35. In anotherembodiment, an anti-Jagged antibody comprises HVRs as in any of theabove embodiments, and further comprises a VL comprising at least one,two, three, or four FRs selected from an FR1 comprising the amino acidsequence of SEQ ID NO:60, 64, 67, or 70; an FR2 comprising the aminoacid sequence of SEQ ID NO:61, 65, 68, or 71; an FR3 comprising theamino acid sequence of SEQ ID NO:62, 66, 69, or 72; and an FR4comprising the amino acid sequence of SEQ ID NO: 63 or 135.

In another aspect, an anti-Jagged antibody comprises a heavy chainvariable domain (VH) sequence having at least 90%, 91%, 92%, 93%, 94%,95%, 96%, 97%, 98%, 99%, or 100% sequence identity to the amino acidsequence of SEQ ID NO:9-17, 29-30 or 73-76. In certain embodiments, a VHsequence having at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or99% identity contains substitutions (e.g., conservative substitutions),insertions, or deletions relative to the reference sequence, but ananti-Jagged antibody comprising that sequence retains the ability tobind to at least one Jagged. In certain embodiments, substitutions,insertions, or deletions occur in regions outside the HVRs (i.e., in theFRs). In certain embodiments, an anti-Jagged antibody comprises a heavychain variable domain (VH) sequence having at least 90%, 91%, 92%, 93%,94%, 95%, 96%, 97%, 98%, 99%, or 100% sequence identity to the aminoacid sequence of SEQ ID NO:11. Optionally, the anti-Jagged antibodycomprises the VH sequence in SEQ ID NO:11, including post-translationalmodifications of that sequence. In a particular embodiment, the VHcomprises one, two or three HVRs selected from: (a) HVR-H1 comprisingthe amino acid sequence of SEQ ID NO:81, (b) HVR-H2 comprising the aminoacid sequence of SEQ ID NO:83, and (c) HVR-H3 comprising the amino acidsequence of SEQ ID NO:85.

In another aspect, an anti-Jagged antibody is provided, wherein theantibody comprises a light chain variable domain (VL) having at least90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% sequenceidentity to the amino acid sequence of SEQ ID NO:18-28 or 77-80. Incertain embodiments, a VL sequence having at least 90%, 91%, 92%, 93%,94%, 95%, 96%, 97%, 98%, or 99% identity contains substitutions (e.g.,conservative substitutions), insertions, or deletions relative to thereference sequence, but an anti-Jagged antibody comprising that sequenceretains the ability to bind to Jagged. In certain embodiments, a totalof 1 to 10 amino acids have been substituted, inserted and/or deleted inSEQ ID NO:20. In certain embodiments, the substitutions, insertions, ordeletions occur in regions outside the HVRs (i.e., in the FRs).Optionally, the anti-Jagged antibody comprises the VL sequence in SEQ IDNO:20, including post-translational modifications of that sequence. In aparticular embodiment, the VL comprises one, two or three HVRs selectedfrom (a) HVR-L1 comprising the amino acid sequence of SEQ ID NO:110; (b)HVR-L2 comprising the amino acid sequence of SEQ ID NO:111; and (c)HVR-L3 comprising the amino acid sequence of SEQ ID NO:112.

In another aspect, an anti-Jagged antibody is provided, wherein theantibody comprises a VH as in any of the embodiments provided above, anda VL as in any of the embodiments provided above. In one embodiment, theantibody comprises the VH and VL sequences in SEQ ID NO:10 and SEQ IDNO:19, respectively, including post-translational modifications of thosesequences. In one embodiment, the antibody comprises the VH and VLsequences in SEQ ID NO:11 and SEQ ID NO:20, respectively, includingpost-translational modifications of those sequences. In one embodiment,the antibody comprises the VH and VL sequences in SEQ ID NO:15 and SEQID NO:24, respectively, including post-translational modifications ofthose sequences.

In a further aspect, the invention provides an antibody that binds tothe same epitope as an anti-Jagged antibody provided herein. Forexample, in certain embodiments, an antibody is provided that binds tothe same epitope as an anti-Jagged1 antibody comprising a VH sequence ofSEQ ID NO:10 and a VL sequence of SEQ ID NO:19. In another embodiments,an antibody is provided that binds to the same epitope as ananti-Jagged1 antibody comprising a VH sequence of SEQ ID NO:11 and a VLsequence of SEQ ID NO:20. In another embodiments, an antibody isprovided that binds to the same epitope as an anti-Jagged2 antibodycomprising a VH sequence of SEQ ID NO:15 and a VL sequence of SEQ IDNO:24.

In certain embodiments, an antibody is provided that binds to an epitopewithin a murine Jag1-DSL-EGF1-4 peptide of SEQ ID NO:5. In certainembodiments, an antibody is provided that binds to an epitope within ahuman Jag1-DSL-EGF1-4 peptide of SEQ ID NO:6. In certain embodiments, anantibody is provided that binds to an epitope within a murineJag2-DSL-EGF1-4 peptide of SEQ ID NO:7. In certain embodiments, anantibody is provided that binds to an epitope within a humanJag2-DSL-EGF1-4 peptide of SEQ ID NO:8.

In a further aspect, the invention provides an antibody that competesfor binding with any of the antibodies provided herein.

In a further aspect of the invention, an anti-Jagged antibody accordingto any of the above embodiments is a monoclonal antibody, including achimeric, humanized or human antibody. In one embodiment, an anti-Jaggedantibody is an antibody fragment, e.g., a Fv, Fab, Fab′, scFv, diabody,or F(ab′)₂ fragment. In another embodiment, the antibody is a fulllength antibody, e.g., an intact human IgG1 antibody or other antibodyclass or isotype as defined herein.

In a further aspect, an anti-Jagged antibody according to any of theabove embodiments may incorporate any of the features, singly or incombination, as described in Sections 1-7 below:

1. Antibody Affinity

In certain embodiments, an antibody provided herein has a dissociationconstant (Kd) of ≦1 μM, ≦100 nM, ≦10 nM, ≦1 nM, ≦0.1 nM, ≦0.01 nM, or≦0.001 nM (e.g. 10⁻⁸ M or less, e.g. from 10⁻⁸ M to 10⁻¹³ M, e.g., from10⁻⁹ M to 10⁻¹³ M).

In one embodiment, Kd is measured by a radiolabeled antigen bindingassay (RIA). In one embodiment, an RIA is performed with the Fab versionof an antibody of interest and its antigen. For example, solutionbinding affinity of Fabs for antigen is measured by equilibrating Fabwith a minimal concentration of (¹²⁵I)-labeled antigen in the presenceof a titration series of unlabeled antigen, then capturing bound antigenwith an anti-Fab antibody-coated plate (see, e.g., Chen et al., J. Mol.Biol. 293:865-881(1999)). To establish conditions for the assay,MICROTITER® multi-well plates (Thermo Scientific) are coated overnightwith 5 μg/ml of a capturing anti-Fab antibody (Cappel Labs) in 50 mMsodium carbonate (pH 9.6), and subsequently blocked with 2% (w/v) bovineserum albumin in PBS for two to five hours at room temperature(approximately 23° C.). In a non-adsorbent plate (Nunc #269620), 100 pMor 26 pM [¹²⁵I]-antigen antigen are mixed with serial dilutions of a Fabof interest (e.g., consistent with assessment of the anti-VEGF antibody,Fab-12, in Presta et al., Cancer Res. 57:4593-4599 (1997)). The Fab ofinterest is then incubated overnight; however, the incubation maycontinue for a longer period (e.g., about 65 hours) to ensure thatequilibrium is reached. Thereafter, the mixtures are transferred to thecapture plate for incubation at room temperature (e.g., for one hour).The solution is then removed and the plate washed eight times with 0.1%polysorbate 20 (TWEEN-20) in PBS. When the plates have dried, 150μl/well of scintillant (MICROSCINT-20™; Packard) is added, and theplates are counted on a TOPCOUNT™ gamma counter (Packard) for tenminutes. Concentrations of each Fab that give less than or equal to 20%of maximal binding are chosen for use in competitive binding assays.

According to another embodiment, Kd is measured using a BIACORE® surfaceplasmon resonance assay. For example, an assay using a BIACORE®-2000 ora BIACORE®-3000 (BIAcore, Inc., Piscataway, N.J.) is performed at 25° C.with immobilized antigen CM5 chips at ˜10 response units (RU). In oneembodiment, carboxymethylated dextran biosensor chips (CM5, BIACORE,Inc.) are activated with N-ethyl-N′-(3-dimethylaminopropyl)-carbodiimidehydrochloride (EDC) and N-hydroxysuccinimide (NHS) according to thesupplier's instructions. Antigen is diluted with 10 mM sodium acetate,pH 4.8, to 5 μg/ml (˜0.2 μM) before injection at a flow rate of 5μl/minute to achieve approximately 10 response units (RU) of coupledprotein. Following the injection of antigen, 1 M ethanolamine isinjected to block unreacted groups. For kinetics measurements, two-foldserial dilutions of Fab (0.78 nM to 500 nM) are injected in PBS with0.05% polysorbate 20 (TWEEN-20™) surfactant (PBST) at 25° C. at a flowrate of approximately 25 μl/min. Association rates (k_(on)) anddissociation rates (k_(off)) are calculated using a simple one-to-oneLangmuir binding model (BIACORE® Evaluation Software version 3.2) bysimultaneously fitting the association and dissociation sensorgrams. Theequilibrium dissociation constant (Kd) is calculated as the ratiok_(off)/k_(on). See, e.g., Chen et al., J. Mol. Biol. 293:865-881(1999). If the on-rate exceeds 10⁶ M⁻¹ s⁻¹ by the surface plasmonresonance assay above, then the on-rate can be determined by using afluorescent quenching technique that measures the increase or decreasein fluorescence emission intensity (excitation=295 nm; emission=340 nm,16 nm band-pass) at 25° C. of a 20 nM anti-antigen antibody (Fab form)in PBS, pH 7.2, in the presence of increasing concentrations of antigenas measured in a spectrometer, such as a stop-flow equippedspectrophometer (Aviv Instruments) or a 8000-series SLM-AMINCO™spectrophotometer (ThermoSpectronic) with a stirred cuvette.

2. Antibody Fragments

In certain embodiments, an antibody provided herein is an antibodyfragment. Antibody fragments include, but are not limited to, Fab, Fab′,Fab′-SH, F(ab′)₂, Fv, and scFv fragments, and other fragments describedbelow. For a review of certain antibody fragments, see Hudson et al.Nat. Med. 9:129-134 (2003). For a review of scFv fragments, see, e.g.,Pluckthün, in The Pharmacology of Monoclonal Antibodies, vol. 113,Rosenburg and Moore eds., (Springer-Verlag, New York), pp. 269-315(1994); see also WO 93/16185; and U.S. Pat. Nos. 5,571,894 and5,587,458. For discussion of Fab and F(ab′)₂ fragments comprisingsalvage receptor binding epitope residues and having increased in vivohalf-life, see U.S. Pat. No. 5,869,046.

Diabodies are antibody fragments with two antigen-binding sites that maybe bivalent or bispecific. See, for example, EP 404,097; WO 1993/01161;Hudson et al., Nat. Med. 9:129-134 (2003); and Hollinger et al., Proc.Natl. Acad. Sci. USA 90: 6444-6448 (1993). Triabodies and tetrabodiesare also described in Hudson et al., Nat. Med. 9:129-134 (2003).

Single-domain antibodies are antibody fragments comprising all or aportion of the heavy chain variable domain or all or a portion of thelight chain variable domain of an antibody. In certain embodiments, asingle-domain antibody is a human single-domain antibody (Domantis,Inc., Waltham, Mass.; see, e.g., U.S. Pat. No. 6,248,516 B1).

Antibody fragments can be made by various techniques, including but notlimited to proteolytic digestion of an intact antibody as well asproduction by recombinant host cells (e.g. E. coli or phage), asdescribed herein.

3. Chimeric and Humanized Antibodies

In certain embodiments, an antibody provided herein is a chimericantibody. Certain chimeric antibodies are described, e.g., in U.S. Pat.No. 4,816,567; and Morrison et al., Proc. Natl. Acad. Sci. USA,81:6851-6855 (1984)). In one example, a chimeric antibody comprises anon-human variable region (e.g., a variable region derived from a mouse,rat, hamster, rabbit, or non-human primate, such as a monkey) and ahuman constant region. In a further example, a chimeric antibody is a“class switched” antibody in which the class or subclass has beenchanged from that of the parent antibody. Chimeric antibodies includeantigen-binding fragments thereof.

In certain embodiments, a chimeric antibody is a humanized antibody.Typically, a non-human antibody is humanized to reduce immunogenicity tohumans, while retaining the specificity and affinity of the parentalnon-human antibody. Generally, a humanized antibody comprises one ormore variable domains in which HVRs, e.g., CDRs, (or portions thereof)are derived from a non-human antibody, and FRs (or portions thereof) arederived from human antibody sequences. A humanized antibody optionallywill also comprise at least a portion of a human constant region. Insome embodiments, some FR residues in a humanized antibody aresubstituted with corresponding residues from a non-human antibody (e.g.,the antibody from which the HVR residues are derived), e.g., to restoreor improve antibody specificity or affinity.

Humanized antibodies and methods of making them are reviewed, e.g., inAlmagro and Fransson, Front. Biosci. 13:1619-1633 (2008), and arefurther described, e.g., in Riechmann et al., Nature 332:323-329 (1988);Queen et al., Proc. Nat'l Acad. Sci. USA 86:10029-10033 (1989); U.S.Pat. Nos. 5,821,337, 7,527,791, 6,982,321, and 7,087,409; Kashmiri etal., Methods 36:25-34 (2005) (describing specificity determining region(SDR) grafting); Padlan, Mol. Immunol. 28:489-498 (1991) (describing“resurfacing”); Dall'Acqua et al., Methods 36:43-60 (2005) (describing“FR shuffling”); and Osbourn et al., Methods 36:61-68 (2005) and Klimkaet al., Br. J. Cancer, 83:252-260 (2000) (describing the “guidedselection” approach to FR shuffling).

Human framework regions that may be used for humanization include butare not limited to: framework regions selected using the “best-fit”method (see, e.g., Sims et al. J. Immunol. 151:2296 (1993)); frameworkregions derived from the consensus sequence of human antibodies of aparticular subgroup of light or heavy chain variable regions (see, e.g.,Carter et al. Proc. Natl. Acad. Sci. USA, 89:4285 (1992); and Presta etal. J. Immunol., 151:2623 (1993)); human mature (somatically mutated)framework regions or human germline framework regions (see, e.g.,Almagro and Fransson, Front. Biosci. 13:1619-1633 (2008)); and frameworkregions derived from screening FR libraries (see, e.g., Baca et al., J.Biol. Chem. 272:10678-10684 (1997) and Rosok et al., J. Biol. Chem.271:22611-22618 (1996)).

4. Human Antibodies

In certain embodiments, an antibody provided herein is a human antibody.Human antibodies can be produced using various techniques known in theart. Human antibodies are described generally in van Dijk and van deWinkel, Curr. Opin. Pharmacol. 5: 368-74 (2001) and Lonberg, Curr. Opin.Immunol. 20:450-459 (2008).

Human antibodies may be prepared by administering an immunogen to atransgenic animal that has been modified to produce intact humanantibodies or intact antibodies with human variable regions in responseto antigenic challenge. Such animals typically contain all or a portionof the human immunoglobulin loci, which replace the endogenousimmunoglobulin loci, or which are present extrachromosomally orintegrated randomly into the animal's chromosomes. In such transgenicmice, the endogenous immunoglobulin loci have generally beeninactivated. For review of methods for obtaining human antibodies fromtransgenic animals, see Lonberg, Nat. Biotech. 23:1117-1125 (2005). Seealso, e.g., U.S. Pat. Nos. 6,075,181 and 6,150,584 describing XENOMOUSE™technology; U.S. Pat. No. 5,770,429 describing HUMAB® technology; U.S.Pat. No. 7,041,870 describing K-M MOUSE® technology, and U.S. PatentApplication Publication No. US 2007/0061900, describing VELOCIMOUSE®technology). Human variable regions from intact antibodies generated bysuch animals may be further modified, e.g., by combining with adifferent human constant region.

Human antibodies can also be made by hybridoma-based methods. Humanmyeloma and mouse-human heteromyeloma cell lines for the production ofhuman monoclonal antibodies have been described. (See, e.g., Kozbor J.Immunol., 133: 3001 (1984); Brodeur et al., Monoclonal AntibodyProduction Techniques and Applications, pp. 51-63 (Marcel Dekker, Inc.,New York, 1987); and Boerner et al., J. Immunol., 147: 86 (1991).) Humanantibodies generated via human B-cell hybridoma technology are alsodescribed in Li et al., Proc. Natl. Acad. Sci., USA, 103:3557-3562(2006). Additional methods include those described, for example, in U.S.Pat. No. 7,189,826 (describing production of monoclonal human IgMantibodies from hybridoma cell lines) and Ni, Xiandai Mianyixue,26(4):265-268 (2006) (describing human-human hybridomas). Humanhybridoma technology (Trioma technology) is also described in Vollmersand Brandlein, Histology and Histopathology, 20(3):927-937 (2005) andVollmers and Brandlein, Methods and Findings in Experimental andClinical Pharmacology, 27(3):185-91 (2005).

Human antibodies may also be generated by isolating Fv clone variabledomain sequences selected from human-derived phage display libraries.Such variable domain sequences may then be combined with a desired humanconstant domain. Techniques for selecting human antibodies from antibodylibraries are described below.

5. Library-Derived Antibodies

Antibodies of the invention may be isolated by screening combinatoriallibraries for antibodies with the desired activity or activities. Forexample, a variety of methods are known in the art for generating phagedisplay libraries and screening such libraries for antibodies possessingthe desired binding characteristics. Such methods are reviewed, e.g., inHoogenboom et al. in Methods in Molecular Biology 178:1-37 (O'Brien etal., ed., Human Press, Totowa, N.J., 2001) and further described, e.g.,in the McCafferty et al., Nature 348:552-554; Clackson et al., Nature352: 624-628 (1991); Marks et al., J. Mol. Biol. 222: 581-597 (1992);Marks and Bradbury, in Methods in Molecular Biology 248:161-175 (Lo,ed., Human Press, Totowa, N.J., 2003); Sidhu et al., J. Mol. Biol.338(2): 299-310 (2004); Lee et al., J. Mol. Biol. 340(5): 1073-1093(2004); Fellouse, Proc. Natl. Acad. Sci. USA 101(34): 12467-12472(2004); and Lee et al., J. Immunol. Methods 284(1-2): 119-132(2004).

In certain phage display methods, repertoires of VH and VL genes areseparately cloned by polymerase chain reaction (PCR) and recombinedrandomly in phage libraries, which can then be screened forantigen-binding phage as described in Winter et al., Ann. Rev. Immunol.,12: 433-455 (1994). Phage typically display antibody fragments, eitheras single-chain Fv (scFv) fragments or as Fab fragments. Libraries fromimmunized sources provide high-affinity antibodies to the immunogenwithout the requirement of constructing hybridomas. Alternatively, thenaive repertoire can be cloned (e.g., from human) to provide a singlesource of antibodies to a wide range of non-self and also self antigenswithout any immunization as described by Griffiths et al., EMBO J, 12:725-734 (1993). Finally, naive libraries can also be made syntheticallyby cloning unrearranged V-gene segments from stem cells, and using PCRprimers containing random sequence to encode the highly variable CDR3regions and to accomplish rearrangement in vitro, as described byHoogenboom and Winter, J. Mol. Biol., 227: 381-388 (1992). Patentpublications describing human antibody phage libraries include, forexample: U.S. Pat. No. 5,750,373, and US Patent Publication Nos.2005/0079574, 2005/0119455, 2005/0266000, 2007/0117126, 2007/0160598,2007/0237764, 2007/0292936, and 2009/0002360.

Antibodies or antibody fragments isolated from human antibody librariesare considered human antibodies or human antibody fragments herein.

6. Multispecific Antibodies

In certain embodiments, an antibody provided herein is a multispecificantibody, e.g. a bispecific antibody. Multispecific antibodies aremonoclonal antibodies that have binding specificities for at least twodifferent sites. In certain embodiments, one of the bindingspecificities is for Jagged and the other is for any other antigen. Incertain embodiments, bispecific antibodies may bind to two differentepitopes of Jagged. Bispecific antibodies may also be used to localizecytotoxic agents to cells which express Jagged. Bispecific antibodiescan be prepared as full length antibodies or antibody fragments.

Techniques for making multispecific antibodies include, but are notlimited to, recombinant co-expression of two immunoglobulin heavychain-light chain pairs having different specificities (see Milstein andCuello, Nature 305: 537 (1983)), WO 93/08829, and Traunecker et al.,EMBO J. 10: 3655 (1991)), and “knob-in-hole” engineering (see, e.g.,U.S. Pat. No. 5,731,168). Multi-specific antibodies may also be made byengineering electrostatic steering effects for making antibodyFc-heterodimeric molecules (WO 2009/089004A1); cross-linking two or moreantibodies or fragments (see, e.g., U.S. Pat. No. 4,676,980, and Brennanet al., Science, 229: 81 (1985)); using leucine zippers to producebi-specific antibodies (see, e.g., Kostelny et al., J. Immunol.,148(5):1547-1553 (1992)); using “diabody” technology for makingbispecific antibody fragments (see, e.g., Hollinger et al., Proc. Natl.Acad. Sci. USA, 90:6444-6448 (1993)); and using single-chain Fv (sFv)dimers (see, e.g. Gruber et al., J. Immunol., 152:5368 (1994)); andpreparing trispecific antibodies as described, e.g., in Tutt et al. J.Immunol. 147: 60 (1991).

Engineered antibodies with three or more functional antigen bindingsites, including “Octopus antibodies,” are also included herein (see,e.g. US 2006/0025576A1).

The antibody or fragment herein also includes a “Dual Acting FAb” or“DAF” comprising an antigen binding site that binds to Jagged as well asanother, different antigen (see, US 2008/0069820, for example).

7. Antibody Variants

In certain embodiments, amino acid sequence variants of the antibodiesprovided herein are contemplated. For example, it may be desirable toimprove the binding affinity and/or other biological properties of theantibody. Amino acid sequence variants of an antibody may be prepared byintroducing appropriate modifications into the nucleotide sequenceencoding the antibody, or by peptide synthesis. Such modificationsinclude, for example, deletions from, and/or insertions into and/orsubstitutions of residues within the amino acid sequences of theantibody. Any combination of deletion, insertion, and substitution canbe made to arrive at the final construct, provided that the finalconstruct possesses the desired characteristics, e.g., antigen-binding.

a) Substitution, Insertion, and Deletion Variants

In certain embodiments, antibody variants having one or more amino acidsubstitutions are provided. Sites of interest for substitutionalmutagenesis include the HVRs and FRs. Conservative substitutions areshown in Table 1 under the heading of “preferred substitutions.” Moresubstantial changes are provided in Table 1 under the heading of“exemplary substitutions,” and as further described below in referenceto amino acid side chain classes. Amino acid substitutions may beintroduced into an antibody of interest and the products screened for adesired activity, e.g., retained/improved antigen binding, decreasedimmunogenicity, or improved ADCC or CDC.

TABLE 1 Original Exemplary Preferred Residue Substitutions SubstitutionsAla (A) Val; Leu; Ile Val Arg (R) Lys; Gln; Asn Lys Asn (N) Gln; His;Asp, Lys; Arg Gln Asp (D) Glu; Asn Glu Cys (C) Ser; Ala Ser Gln (Q) Asn;Glu Asn Glu (E) Asp; Gln Asp Gly (G) Ala Ala His (H) Asn; Gln; Lys; ArgArg Ile (I) Leu; Val; Met; Ala; Leu Phe; Norleucine Leu (L) Norleucine;Ile; Val; Ile Met; Ala; Phe Lys (K) Arg; Gln; Asn Arg Met (M) Leu; Phe;Ile Leu Phe (F) Trp; Leu; Val; Ile; Ala; Tyr Tyr Pro (P) Ala Ala Ser (S)Thr Thr Thr (T) Val; Ser Ser Trp (W) Tyr; Phe Tyr Tyr (Y) Trp; Phe; Thr;Ser Phe Val (V) Ile; Leu; Met; Phe; Leu Ala; NorleucineAmino acids may be grouped according to common side-chain properties:

(1) hydrophobic: Norleucine, Met, Ala, Val, Leu, Ile;

(2) neutral hydrophilic: Cys, Ser, Thr, Asn, Gln;

(3) acidic: Asp, Glu;

(4) basic: His, Lys, Arg;

(5) residues that influence chain orientation: Gly, Pro;

(6) aromatic: Trp, Tyr, Phe.

Non-conservative substitutions will entail exchanging a member of one ofthese classes for another class.

One type of substitutional variant involves substituting one or morehypervariable region residues of a parent antibody (e.g. a humanized orhuman antibody). Generally, the resulting variant(s) selected forfurther study will have modifications (e.g., improvements) in certainbiological properties (e.g., increased affinity, reduced immunogenicity)relative to the parent antibody and/or will have substantially retainedcertain biological properties of the parent antibody. An exemplarysubstitutional variant is an affinity matured antibody, which may beconveniently generated, e.g., using phage display-based affinitymaturation techniques such as those described herein. Briefly, one ormore HVR residues are mutated and the variant antibodies displayed onphage and screened for a particular biological activity (e.g. bindingaffinity).

Alterations (e.g., substitutions) may be made in HVRs, e.g., to improveantibody affinity. Such alterations may be made in HVR “hotspots,” i.e.,residues encoded by codons that undergo mutation at high frequencyduring the somatic maturation process (see, e.g., Chowdhury, MethodsMol. Biol. 207:179-196 (2008)), and/or residues that contact antigen,with the resulting variant VH or VL being tested for binding affinity.Affinity maturation by constructing and reselecting from secondarylibraries has been described, e.g., in Hoogenboom et al. in Methods inMolecular Biology 178:1-37 (O'Brien et al., ed., Human Press, Totowa,N.J., (2001).) In some embodiments of affinity maturation, diversity isintroduced into the variable genes chosen for maturation by any of avariety of methods (e.g., error-prone PCR, chain shuffling, oroligonucleotide-directed mutagenesis). A secondary library is thencreated. The library is then screened to identify any antibody variantswith the desired affinity. Another method to introduce diversityinvolves HVR-directed approaches, in which several HVR residues (e.g.,4-6 residues at a time) are randomized HVR residues involved in antigenbinding may be specifically identified, e.g., using alanine scanningmutagenesis or modeling. CDR-H3 and CDR-L3 in particular are oftentargeted.

In certain embodiments, substitutions, insertions, or deletions mayoccur within one or more HVRs so long as such alterations do notsubstantially reduce the ability of the antibody to bind antigen. Forexample, conservative alterations (e.g., conservative substitutions asprovided herein) that do not substantially reduce binding affinity maybe made in HVRs. Such alterations may, for example, be outside ofantigen contacting residues in the HVRs. In certain embodiments of thevariant VH and VL sequences provided above, each HVR either isunaltered, or contains no more than one, two or three amino acidsubstitutions.

A useful method for identification of residues or regions of an antibodythat may be targeted for mutagenesis is called “alanine scanningmutagenesis” as described by Cunningham and Wells (1989) Science,244:1081-1085. In this method, a residue or group of target residues(e.g., charged residues such as arg, asp, his, lys, and glu) areidentified and replaced by a neutral or negatively charged amino acid(e.g., alanine or polyalanine) to determine whether the interaction ofthe antibody with antigen is affected. Further substitutions may beintroduced at the amino acid locations demonstrating functionalsensitivity to the initial substitutions. Alternatively, oradditionally, a crystal structure of an antigen-antibody complex toidentify contact points between the antibody and antigen. Such contactresidues and neighboring residues may be targeted or eliminated ascandidates for substitution. Variants may be screened to determinewhether they contain the desired properties.

Amino acid sequence insertions include amino- and/or carboxyl-terminalfusions ranging in length from one residue to polypeptides containing ahundred or more residues, as well as intrasequence insertions of singleor multiple amino acid residues. Examples of terminal insertions includean antibody with an N-terminal methionyl residue. Other insertionalvariants of the antibody molecule include the fusion to the N- orC-terminus of the antibody to an enzyme (e.g. for ADEPT) or apolypeptide which increases the serum half-life of the antibody.

b) Glycosylation Variants

In certain embodiments, an antibody provided herein is altered toincrease or decrease the extent to which the antibody is glycosylated.Addition or deletion of glycosylation sites to an antibody may beconveniently accomplished by altering the amino acid sequence such thatone or more glycosylation sites is created or removed.

Where the antibody comprises an Fc region, the carbohydrate attachedthereto may be altered. Native antibodies produced by mammalian cellstypically comprise a branched, biantennary oligosaccharide that isgenerally attached by an N-linkage to Asn297 of the CH2 domain of the Fcregion. See, e.g., Wright et al. TIBTECH 15:26-32 (1997). Theoligosaccharide may include various carbohydrates, e.g., mannose,N-acetyl glucosamine (GlcNAc), galactose, and sialic acid, as well as afucose attached to a GlcNAc in the “stem” of the biantennaryoligosaccharide structure. In some embodiments, modifications of theoligosaccharide in an antibody of the invention may be made in order tocreate antibody variants with certain improved properties.

In one embodiment, antibody variants are provided having a carbohydratestructure that lacks fucose attached (directly or indirectly) to an Fcregion. For example, the amount of fucose in such antibody may be from1% to 80%, from 1% to 65%, from 5% to 65% or from 20% to 40%. The amountof fucose is determined by calculating the average amount of fucosewithin the sugar chain at Asn297, relative to the sum of allglycostructures attached to Asn 297 (e.g. complex, hybrid and highmannose structures) as measured by MALDI-TOF mass spectrometry, asdescribed in WO 2008/077546, for example. Asn297 refers to theasparagine residue located at about position 297 in the Fc region (Eunumbering of Fc region residues); however, Asn297 may also be locatedabout ±3 amino acids upstream or downstream of position 297, i.e.,between positions 294 and 300, due to minor sequence variations inantibodies. Such fucosylation variants may have improved ADCC function.See, e.g., US Patent Publication Nos. US 2003/0157108 (Presta, L.); US2004/0093621 (Kyowa Hakko Kogyo Co., Ltd). Examples of publicationsrelated to “defucosylated” or “fucose-deficient” antibody variantsinclude: US 2003/0157108; WO 2000/61739; WO 2001/29246; US 2003/0115614;US 2002/0164328; US 2004/0093621; US 2004/0132140; US 2004/0110704; US2004/0110282; US 2004/0109865; WO 2003/085119; WO 2003/084570; WO2005/035586; WO 2005/035778; WO2005/053742; WO2002/031140; Okazaki etal. J. Mol. Biol. 336:1239-1249 (2004); Yamane-Ohnuki et al. Biotech.Bioeng. 87: 614 (2004). Examples of cell lines capable of producingdefucosylated antibodies include Lec13 CHO cells deficient in proteinfucosylation (Ripka et al. Arch. Biochem. Biophys. 249:533-545 (1986);US Pat Appl No US 2003/0157108 A1, Presta, L; and WO 2004/056312 A1,Adams et al., especially at Example 11), and knockout cell lines, suchas alpha-1,6-fucosyltransferase gene, FUT8, knockout CHO cells (see,e.g., Yamane-Ohnuki et al. Biotech. Bioeng. 87: 614 (2004); Kanda, Y. etal., Biotechnol. Bioeng., 94(4):680-688 (2006); and WO2003/085107).

Antibodies variants are further provided with bisected oligosaccharides,e.g., in which a biantennary oligosaccharide attached to the Fc regionof the antibody is bisected by GlcNAc. Such antibody variants may havereduced fucosylation and/or improved ADCC function. Examples of suchantibody variants are described, e.g., in WO 2003/011878 (Jean-Mairet etal.); U.S. Pat. No. 6,602,684 (Umana et al.); and US 2005/0123546 (Umanaet al.). Antibody variants with at least one galactose residue in theoligosaccharide attached to the Fc region are also provided. Suchantibody variants may have improved CDC function. Such antibody variantsare described, e.g., in WO 1997/30087 (Patel et al.); WO 1998/58964(Raju, S.); and WO 1999/22764 (Raju, S.).

c) Fc Region Variants

In certain embodiments, one or more amino acid modifications may beintroduced into the Fc region of an antibody provided herein, therebygenerating an Fc region variant. The Fc region variant may comprise ahuman Fc region sequence (e.g., a human IgG1, IgG2, IgG3 or IgG4 Fcregion) comprising an amino acid modification (e.g. a substitution) atone or more amino acid positions.

In certain embodiments, the invention contemplates an antibody variantthat possesses some but not all effector functions, which make it adesirable candidate for applications in which the half life of theantibody in vivo is important yet certain effector functions (such ascomplement and ADCC) are unnecessary or deleterious. In vitro and/or invivo cytotoxicity assays can be conducted to confirm thereduction/depletion of CDC and/or ADCC activities. For example, Fcreceptor (FcR) binding assays can be conducted to ensure that theantibody lacks FcγR binding (hence likely lacking ADCC activity), butretains FcRn binding ability. The primary cells for mediating ADCC, NKcells, express Fc (RIII only, whereas monocytes express Fc (RI, Fc (RIIand Fc (RIII. FcR expression on hematopoietic cells is summarized inTable 3 on page 464 of Ravetch and Kinet, Annu. Rev. Immunol. 9:457-492(1991). Non-limiting examples of in vitro assays to assess ADCC activityof a molecule of interest is described in U.S. Pat. No. 5,500,362 (see,e.g. Hellstrom, I. et al. Proc. Nat'l Acad. Sci. USA 83:7059-7063(1986)) and Hellstrom, I et al., Proc. Nat'l Acad. Sci. USA 82:1499-1502(1985); 5,821,337 (see Bruggemann, M. et al., J. Exp. Med. 166:1351-1361(1987)). Alternatively, non-radioactive assays methods may be employed(see, for example, ACTI™ non-radioactive cytotoxicity assay for flowcytometry (CellTechnology, Inc. Mountain View, Calif.; and CytoTox 96®non-radioactive cytotoxicity assay (Promega, Madison, Wis.). Usefuleffector cells for such assays include peripheral blood mononuclearcells (PBMC) and Natural Killer (NK) cells. Alternatively, oradditionally, ADCC activity of the molecule of interest may be assessedin vivo, e.g., in a animal model such as that disclosed in Clynes et al.Proc. Nat'l Acad. Sci. USA 95:652-656 (1998). C1q binding assays mayalso be carried out to confirm that the antibody is unable to bind C1qand hence lacks CDC activity. See, e.g., C1q and C3c binding ELISA in WO2006/029879 and WO 2005/100402. To assess complement activation, a CDCassay may be performed (see, for example, Gazzano-Santoro et al., J.Immunol. Methods 202:163 (1996); Cragg, M. S. et al., Blood101:1045-1052 (2003); and Cragg, M. S. and M. J. Glennie, Blood103:2738-2743 (2004)). FcRn binding and in vivo clearance/half lifedeterminations can also be performed using methods known in the art(see, e.g., Petkova, S. B. et al., Int'l. Immunol. 18(12):1759-1769(2006)).

Antibodies with reduced effector function include those withsubstitution of one or more of Fc region residues 238, 265, 269, 270,297, 327 and 329 (U.S. Pat. No. 6,737,056). Such Fc mutants include Fcmutants with substitutions at two or more of amino acid positions 265,269, 270, 297 and 327, including the so-called “DANA” Fc mutant withsubstitution of residues 265 and 297 to alanine (U.S. Pat. No.7,332,581).

Certain antibody variants with improved or diminished binding to FcRsare described. (See, e.g., U.S. Pat. No. 6,737,056; WO 2004/056312, andShields et al., J. Biol. Chem. 9(2): 6591-6604 (2001).)

In certain embodiments, an antibody variant comprises an Fc region withone or more amino acid substitutions which improve ADCC, e.g.,substitutions at positions 298, 333, and/or 334 of the Fc region (EUnumbering of residues).

In some embodiments, alterations are made in the Fc region that resultin altered (i.e., either improved or diminished) C1q binding and/orComplement Dependent Cytotoxicity

(CDC), e.g., as described in U.S. Pat. No. 6,194,551, WO 99/51642, andIdusogie et al. J. Immunol. 164: 4178-4184 (2000).

Antibodies with increased half lives and improved binding to theneonatal Fc receptor (FcRn), which is responsible for the transfer ofmaternal IgGs to the fetus (Guyer et al., J. Immunol. 117:587 (1976) andKim et al., J. Immunol. 24:249 (1994)), are described inUS2005/0014934A1 (Hinton et al.). Those antibodies comprise an Fc regionwith one or more substitutions therein which improve binding of the Fcregion to FcRn. Such Fc variants include those with substitutions at oneor more of Fc region residues: 238, 256, 265, 272, 286, 303, 305, 307,311, 312, 317, 340, 356, 360, 362, 376, 378, 380, 382, 413, 424 or 434,e.g., substitution of Fc region residue 434 (U.S. Pat. No. 7,371,826).

See also Duncan & Winter, Nature 322:738-40 (1988); U.S. Pat. No.5,648,260; U.S. Pat. No. 5,624,821; and WO 94/29351 concerning otherexamples of Fc region variants.

d) Cysteine Engineered Antibody Variants

In certain embodiments, it may be desirable to create cysteineengineered antibodies, e.g., “thioMAbs,” in which one or more residuesof an antibody are substituted with cysteine residues. In particularembodiments, the substituted residues occur at accessible sites of theantibody. By substituting those residues with cysteine, reactive thiolgroups are thereby positioned at accessible sites of the antibody andmay be used to conjugate the antibody to other moieties, such as drugmoieties or linker-drug moieties, to create an immunoconjugate, asdescribed further herein. In certain embodiments, any one or more of thefollowing residues may be substituted with cysteine: V205 (Kabatnumbering) of the light chain; A118 (EU numbering) of the heavy chain;and S400 (EU numbering) of the heavy chain Fc region. Cysteineengineered antibodies may be generated as described, e.g., in U.S. Pat.No. 7,521,541.

e) Antibody Derivatives

In certain embodiments, an antibody provided herein may be furthermodified to contain additional nonproteinaceous moieties that are knownin the art and readily available. The moieties suitable forderivatization of the antibody include but are not limited to watersoluble polymers. Non-limiting examples of water soluble polymersinclude, but are not limited to, polyethylene glycol (PEG), copolymersof ethylene glycol/propylene glycol, carboxymethylcellulose, dextran,polyvinyl alcohol, polyvinyl pyrrolidone, poly-1,3-dioxolane,poly-1,3,6-trioxane, ethylene/maleic anhydride copolymer, polyaminoacids(either homopolymers or random copolymers), and dextran or poly(n-vinylpyrrolidone)polyethylene glycol, propropylene glycol homopolymers,prolypropylene oxide/ethylene oxide co-polymers, polyoxyethylatedpolyols (e.g., glycerol), polyvinyl alcohol, and mixtures thereof.Polyethylene glycol propionaldehyde may have advantages in manufacturingdue to its stability in water. The polymer may be of any molecularweight, and may be branched or unbranched. The number of polymersattached to the antibody may vary, and if more than one polymer areattached, they can be the same or different molecules. In general, thenumber and/or type of polymers used for derivatization can be determinedbased on considerations including, but not limited to, the particularproperties or functions of the antibody to be improved, whether theantibody derivative will be used in a therapy under defined conditions,etc.

In another embodiment, conjugates of an antibody and nonproteinaceousmoiety that may be selectively heated by exposure to radiation areprovided. In one embodiment, the nonproteinaceous moiety is a carbonnanotube (Kam et al., Proc. Natl. Acad. Sci. USA 102: 11600-11605(2005)). The radiation may be of any wavelength, and includes, but isnot limited to, wavelengths that do not harm ordinary cells, but whichheat the nonproteinaceous moiety to a temperature at which cellsproximal to the antibody-nonproteinaceous moiety are killed.

B. Recombinant Methods and Compositions

Antibodies may be produced using recombinant methods and compositions,e.g., as described in U.S. Pat. No. 4,816,567. In one embodiment,isolated nucleic acid encoding an anti-Jagged antibody described hereinis provided. Such nucleic acid may encode an amino acid sequencecomprising the VL and/or an amino acid sequence comprising the VH of theantibody (e.g., the light and/or heavy chains of the antibody). In afurther embodiment, one or more vectors (e.g., expression vectors)comprising such nucleic acid are provided. In a further embodiment, ahost cell comprising such nucleic acid is provided. In one suchembodiment, a host cell comprises (e.g., has been transformed with): (1)a vector comprising a nucleic acid that encodes an amino acid sequencecomprising the VL of the antibody and an amino acid sequence comprisingthe VH of the antibody, or (2) a first vector comprising a nucleic acidthat encodes an amino acid sequence comprising the VL of the antibodyand a second vector comprising a nucleic acid that encodes an amino acidsequence comprising the VH of the antibody. In one embodiment, the hostcell is eukaryotic, e.g. a Chinese Hamster Ovary (CHO) cell or lymphoidcell (e.g., Y0, NS0, Sp20 cell). In one embodiment, a method of makingan anti-Jagged antibody is provided, wherein the method comprisesculturing a host cell comprising a nucleic acid encoding the antibody,as provided above, under conditions suitable for expression of theantibody, and optionally recovering the antibody from the host cell (orhost cell culture medium).

For recombinant production of an anti-Jagged antibody, nucleic acidencoding an antibody, e.g., as described above, is isolated and insertedinto one or more vectors for further cloning and/or expression in a hostcell. Such nucleic acid may be readily isolated and sequenced usingconventional procedures (e.g., by using oligonucleotide probes that arecapable of binding specifically to genes encoding the heavy and lightchains of the antibody).

Suitable host cells for cloning or expression of antibody-encodingvectors include prokaryotic or eukaryotic cells described herein. Forexample, antibodies may be produced in bacteria, in particular whenglycosylation and Fc effector function are not needed. For expression ofantibody fragments and polypeptides in bacteria, see, e.g., U.S. Pat.Nos. 5,648,237, 5,789,199, and 5,840,523. (See also Charlton, Methods inMolecular Biology, Vol. 248 (B. K. C. Lo, ed., Humana Press, Totowa,N.J., 2003), pp. 245-254, describing expression of antibody fragments inE. coli.) After expression, the antibody may be isolated from thebacterial cell paste in a soluble fraction and can be further purified.

In addition to prokaryotes, eukaryotic microbes such as filamentousfungi or yeast are suitable cloning or expression hosts forantibody-encoding vectors, including fungi and yeast strains whoseglycosylation pathways have been “humanized,” resulting in theproduction of an antibody with a partially or fully human glycosylationpattern. See Gerngross, Nat. Biotech. 22:1409-1414 (2004), and Li etal., Nat. Biotech. 24:210-215 (2006).

Suitable host cells for the expression of glycosylated antibody are alsoderived from multicellular organisms (invertebrates and vertebrates).Examples of invertebrate cells include plant and insect cells. Numerousbaculoviral strains have been identified which may be used inconjunction with insect cells, particularly for transfection ofSpodoptera frugiperda cells.

Plant cell cultures can also be utilized as hosts. See, e.g., U.S. Pat.Nos. 5,959,177, 6,040,498, 6,420,548, 7,125,978, and 6,417,429(describing PLANTIBODIES™ technology for producing antibodies intransgenic plants).

Vertebrate cells may also be used as hosts. For example, mammalian celllines that are adapted to grow in suspension may be useful. Otherexamples of useful mammalian host cell lines are monkey kidney CV1 linetransformed by SV40 (COS-7); human embryonic kidney line (293 or 293cells as described, e.g., in Graham et al., J. Gen Virol. 36:59 (1977));baby hamster kidney cells (BHK); mouse sertoli cells (TM4 cells asdescribed, e.g., in Mather, Biol. Reprod. 23:243-251 (1980)); monkeykidney cells (CV1); African green monkey kidney cells (VERO-76); humancervical carcinoma cells (HELA); canine kidney cells (MDCK; buffalo ratliver cells (BRL 3A); human lung cells (W138); human liver cells (HepG2); mouse mammary tumor (MMT 060562); TRI cells, as described, e.g., inMather et al., Annals N.Y. Acad. Sci. 383:44-68 (1982); MRC 5 cells; andFS4 cells. Other useful mammalian host cell lines include Chinesehamster ovary (CHO) cells, including DHFR⁻ CHO cells (Urlaub et al.,Proc. Natl. Acad. Sci. USA 77:4216 (1980)); and myeloma cell lines suchas Y0, NS0 and Sp2/0. For a review of certain mammalian host cell linessuitable for antibody production, see, e.g., Yazaki and Wu, Methods inMolecular Biology, Vol. 248 (B. K. C. Lo, ed., Humana Press, Totowa,N.J.), pp. 255-268 (2003).

C. Assays

Anti-Jagged antibodies provided herein may be identified, screened for,or characterized for their physical/chemical properties and/orbiological activities by various assays known in the art.

1. Binding Assays and Other Assays

In one aspect, an antibody of the invention is tested for its antigenbinding activity, e.g., by known methods such as ELISA, Western blot,etc.

In another aspect, competition assays may be used to identify anantibody that competes with antibody A, A-1, A-2, C, C-1, D, D-1, D-2,D-3, D-4 and D-5 for binding to human or murine Jagged1. In anotheraspect, competition assays may be used to identify an antibody thatcompetes with antibody B, B-1, B-2, B-3, C, C-1, D, D-1, D-2, D-3, D-4and D-5 for binding to human or murine Jagged2. In certain embodiments,such a competing antibody binds to the same epitope (e.g., a linear or aconformational epitope) that is bound by A, A-1, A-2, B, B-1, B-2, B-3,C, C-1, D, D-1, D-2, D-3, D-4 or D-5.

Detailed exemplary methods for mapping an epitope to which an antibodybinds are provided in Morris (1996) “Epitope Mapping Protocols,” inMethods in Molecular Biology vol. 66 (Humana Press, Totowa, N.J.).

In an exemplary competition assay, immobilized Jagged1 or Jagged2 isincubated in a solution comprising a first labeled antibody that bindsto Jagged1 or Jagged2 (e.g., A, A-1, A-2, B, B-1, B-2, B-3, C, C-1, D,D-1, D-2, D-3, D-4 or D-5) and a second unlabeled antibody that is beingtested for its ability to compete with the first antibody for binding toJagged1 or Jagged2. The second antibody may be present in a hybridomasupernatant. As a control, immobilized Jagged1 or Jagged2 is incubatedin a solution comprising the first labeled antibody but not the secondunlabeled antibody. After incubation under conditions permissive forbinding of the first antibody to Jagged1 or Jagged2, excess unboundantibody is removed, and the amount of label associated with immobilizedJagged1 or Jagged2 is measured. If the amount of label associated withimmobilized Jagged1 or Jagged2 is substantially reduced in the testsample relative to the control sample, then that indicates that thesecond antibody is competing with the first antibody for binding toJagged1 or Jagged2. See Harlow and Lane (1988) Antibodies: A LaboratoryManual ch. 14 (Cold Spring Harbor Laboratory, Cold Spring Harbor, N.Y.).

2. Activity Assays

In one aspect, assays are provided for identifying anti-Jaggedantibodies thereof having biological activity. Biological activity mayinclude, e.g., inhibition of Jagged1- or Jagged2-induced cell signalingthrough a Notch receptor, such as inhibition of Jagged1-inducedsignaling through Notch1. An exemplary assay is provided in theExamples. In certain other embodiments, an antibody of the invention istested for its ability to inhibit expression of a reporter gene that isresponsive to Jagged1-induced Notch signaling. An exemplary assay isprovided in the Examples. In certain embodiments, an antibody of theinvention is tested for such biological activity. Antibodies having suchbiological activity in vivo and/or in vitro are also provided.

D. Immunoconjugates

The invention also provides immunoconjugates comprising an anti-Jaggedantibody herein conjugated to one or more cytotoxic agents, such aschemotherapeutic agents or drugs, growth inhibitory agents, toxins(e.g., protein toxins, enzymatically active toxins of bacterial, fungal,plant, or animal origin, or fragments thereof), or radioactive isotopes.

In one embodiment, an immunoconjugate is an antibody-drug conjugate(ADC) in which an antibody is conjugated to one or more drugs, includingbut not limited to a maytansinoid (see U.S. Pat. Nos. 5,208,020,5,416,064 and European Patent EP 0 425 235 B1); an auristatin such asmonomethylauristatin drug moieties DE and DF (MMAE and MMAF) (see U.S.Pat. Nos. 5,635,483 and 5,780,588, and 7,498,298); a dolastatin; acalicheamicin or derivative thereof (see U.S. Pat. Nos. 5,712,374,5,714,586, 5,739,116, 5,767,285, 5,770,701, 5,770,710, 5,773,001, and5,877,296; Hinman et al., Cancer Res. 53:3336-3342 (1993); and Lode etal., Cancer Res. 58:2925-2928 (1998)); an anthracycline such asdaunomycin or doxorubicin (see Kratz et al., Current Med. Chem.13:477-523 (2006); Jeffrey et al., Bioorganic & Med. Chem. Letters16:358-362 (2006); Torgov et al., Bioconj. Chem. 16:717-721 (2005); Nagyet al., Proc. Natl. Acad. Sci. USA 97:829-834 (2000); Dubowchik et al.,Bioorg. & Med. Chem. Letters 12:1529-1532 (2002); King et al., J. Med.Chem. 45:4336-4343 (2002); and U.S. Pat. No. 6,630,579); methotrexate;vindesine; a taxane such as docetaxel, paclitaxel, larotaxel, tesetaxel,and ortataxel; a trichothecene; and CC1065.

In another embodiment, an immunoconjugate comprises an antibody asdescribed herein conjugated to an enzymatically active toxin or fragmentthereof, including but not limited to diphtheria A chain, nonbindingactive fragments of diphtheria toxin, exotoxin A chain (from Pseudomonasaeruginosa), ricin A chain, abrin A chain, modeccin A chain,alpha-sarcin, Aleurites fordii proteins, dianthin proteins, Phytolacaamericana proteins (PAPI, PAPII, and PAP-S), momordica charantiainhibitor, curcin, crotin, sapaonaria officinalis inhibitor, gelonin,mitogellin, restrictocin, phenomycin, enomycin, and the tricothecenes.

In another embodiment, an immunoconjugate comprises an antibody asdescribed herein conjugated to a radioactive atom to form aradioconjugate. A variety of radioactive isotopes are available for theproduction of radioconjugates. Examples include At²¹¹, I¹³¹, I¹²⁵, Y⁹⁰,Re¹⁸⁶, Re¹⁸⁸, Sm¹⁵³, Bi²¹², P³², Pb²¹² and radioactive isotopes of Lu.When the radioconjugate is used for detection, it may comprise aradioactive atom for scintigraphic studies, for example tc99m or I123,or a spin label for nuclear magnetic resonance (NMR) imaging (also knownas magnetic resonance imaging, mri), such as iodine-123 again,iodine-131, indium-111, fluorine-19, carbon-13, nitrogen-15, oxygen-17,gadolinium, manganese or iron.

Conjugates of an antibody and cytotoxic agent may be made using avariety of bifunctional protein coupling agents such asN-succinimidyl-3-(2-pyridyldithio) propionate (SPDP),succinimidyl-4-(N-maleimidomethyl) cyclohexane-1-carboxylate (SMCC),iminothiolane (IT), bifunctional derivatives of imidoesters (such asdimethyl adipimidate HCl), active esters (such as disuccinimidylsuberate), aldehydes (such as glutaraldehyde), bis-azido compounds (suchas bis(p-azidobenzoyl) hexanediamine), bis-diazonium derivatives (suchas bis-(p-diazoniumbenzoyl)-ethylenediamine), diisocyanates (such astoluene 2,6-diisocyanate), and bis-active fluorine compounds (such as1,5-difluoro-2,4-dinitrobenzene). For example, a ricin immunotoxin canbe prepared as described in Vitetta et al., Science 238:1098 (1987).Carbon-14-labeled 1-isothiocyanatobenzyl-3-methyldiethylenetriaminepentaacetic acid (MX-DTPA) is an exemplary chelating agent forconjugation of radionucleotide to the antibody. See WO94/11026. Thelinker may be a “cleavable linker” facilitating release of a cytotoxicdrug in the cell. For example, an acid-labile linker,peptidase-sensitive linker, photolabile linker, dimethyl linker ordisulfide-containing linker (Chari et al., Cancer Res. 52:127-131(1992); U.S. Pat. No. 5,208,020) may be used.

The immunuoconjugates or ADCs herein expressly contemplate, but are notlimited to such conjugates prepared with cross-linker reagentsincluding, but not limited to, BMPS, EMCS, GMBS, HBVS, LC-SMCC, MBS,MPBH, SBAP, SIA, SIAB, SMCC, SMPB, SMPH, sulfo-EMCS, sulfo-GMBS,sulfo-KMUS, sulfo-MBS, sulfo-SIAB, sulfo-SMCC, and sulfo-SMPB, and SVSB(succinimidyl-(4-vinylsulfone)benzoate) which are commercially available(e.g., from Pierce Biotechnology, Inc., Rockford, Ill., U.S.A).

E. Methods and Compositions for Diagnostics and Detection

In certain embodiments, any of the anti-Jagged1 antibodies providedherein is useful for detecting the presence of Jagged1 in a biologicalsample. In certain embodiments, any of the anti-Jagged2 antibodiesprovided herein is useful for detecting the presence of Jagged2 in abiological sample. The term “detecting” as used herein encompassesquantitative or qualitative detection. In certain embodiments, abiological sample comprises a cell or tissue, such as cancerous tissues.

In one embodiment, an anti-Jagged antibody for use in a method ofdiagnosis or detection is provided. In a further aspect, a method ofdetecting the presence of Jagged1 in a biological sample is provided. Ina further aspect, a method of detecting the presence of Jagged2 in abiological sample is provided. In certain embodiments, the methodcomprises contacting the biological sample with an anti-Jagged1 antibodyor with an anti-Jagged2 antibody as described herein under conditionspermissive for binding of the anti-Jagged1 antibody or the anti-Jagged2antibody to Jagged1 and Jagged2, respectively, and detecting whether acomplex is formed between the anti-Jagged1 antibody and Jagged1, orbetween the anti-Jagged2 antibody and Jagged2. Such method may be an invitro or in vivo method. In one embodiment, an anti-Jagged1 antibody isused to select subjects eligible for therapy with an anti-Jagged1antibody, e.g. where Jagged1 is a biomarker for selection of patients.In one embodiment, an anti-Jagged2 antibody is used to select subjectseligible for therapy with an anti-Jagged2 antibody, e.g. where Jagged2is a biomarker for selection of patients.

Exemplary disorders that may be diagnosed using an antibody of theinvention include cancer, e.g., breast cancer, lung cancer, braincancer, cervical cancer, colon cancer, liver cancer, bile duct cancer,pancreatic cancer, skin cancer, B-cell malignancies, and T-cellmalignancies.

In certain embodiments, labeled anti-Jagged antibodies are provided.Labels include, but are not limited to, labels or moieties that aredetected directly (such as fluorescent, chromophoric, electron-dense,chemiluminescent, and radioactive labels), as well as moieties, such asenzymes or ligands, that are detected indirectly, e.g., through anenzymatic reaction or molecular interaction. Exemplary labels include,but are not limited to, the radioisotopes ³²P, ¹⁴c, ¹²⁵I, ³H, and ¹³¹I,fluorophores such as rare earth chelates or fluorescein and itsderivatives, rhodamine and its derivatives, dansyl, umbelliferone,luceriferases, e.g., firefly luciferase and bacterial luciferase (U.S.Pat. No. 4,737,456), luciferin, 2,3-dihydrophthalazinediones,horseradish peroxidase (HRP), alkaline phosphatase, β-galactosidase,glucoamylase, lysozyme, saccharide oxidases, e.g., glucose oxidase,galactose oxidase, and glucose-6-phosphate dehydrogenase, heterocyclicoxidases such as uricase and xanthine oxidase, coupled with an enzymethat employs hydrogen peroxide to oxidize a dye precursor such as HRP,lactoperoxidase, or microperoxidase, biotin/avidin, spin labels,bacteriophage labels, stable free radicals, and the like.

F. Pharmaceutical Formulations

Pharmaceutical formulations of an anti-Jagged antibody as describedherein are prepared by mixing such antibody having the desired degree ofpurity with one or more optional pharmaceutically acceptable carriers(Remington's Pharmaceutical Sciences 16th edition, Osol, A. Ed. (1980)),in the form of lyophilized formulations or aqueous solutions.Pharmaceutically acceptable carriers are generally nontoxic torecipients at the dosages and concentrations employed, and include, butare not limited to: buffers such as phosphate, citrate, and otherorganic acids; antioxidants including ascorbic acid and methionine;preservatives (such as octadecyldimethylbenzyl ammonium chloride;hexamethonium chloride; benzalkonium chloride; benzethonium chloride;phenol, butyl or benzyl alcohol; alkyl parabens such as methyl or propylparaben; catechol; resorcinol; cyclohexanol; 3-pentanol; and m-cresol);low molecular weight (less than about 10 residues) polypeptides;proteins, such as serum albumin, gelatin, or immunoglobulins;hydrophilic polymers such as polyvinylpyrrolidone; amino acids such asglycine, glutamine, asparagine, histidine, arginine, or lysine;monosaccharides, disaccharides, and other carbohydrates includingglucose, mannose, or dextrins; chelating agents such as EDTA; sugarssuch as sucrose, mannitol, trehalose or sorbitol; salt-formingcounter-ions such as sodium; metal complexes (e.g. Zn-proteincomplexes); and/or non-ionic surfactants such as polyethylene glycol(PEG). Exemplary pharmaceutically acceptable carriers herein furtherinclude insterstitial drug dispersion agents such as solubleneutral-active hyaluronidase glycoproteins (sHASEGP), for example, humansoluble PH-20 hyaluronidase glycoproteins, such as rHuPH20 (HYLENEX®,Baxter International, Inc.). Certain exemplary sHASEGPs and methods ofuse, including rHuPH20, are described in US Patent Publication Nos.2005/0260186 and 2006/0104968. In one aspect, a sHASEGP is combined withone or more additional glycosaminoglycanases such as chondroitinases.

Exemplary lyophilized antibody formulations are described in U.S. Pat.No. 6,267,958. Aqueous antibody formulations include those described inU.S. Pat. No. 6,171,586 and WO2006/044908, the latter formulationsincluding a histidine-acetate buffer.

The formulation herein may also contain more than one active ingredientsas necessary for the particular indication being treated, preferablythose with complementary activities that do not adversely affect eachother. For example, it may be desirable to further provide a cytotoxicagent, e.g., a chemotherapeutic agent. Such active ingredients aresuitably present in combination in amounts that are effective for thepurpose intended.

Active ingredients may be entrapped in microcapsules prepared, forexample, by coacervation techniques or by interfacial polymerization,for example, hydroxymethylcellulose or gelatin-microcapsules andpoly-(methylmethacylate) microcapsules, respectively, in colloidal drugdelivery systems (for example, liposomes, albumin microspheres,microemulsions, nano-particles and nanocapsules) or in macroemulsions.Such techniques are disclosed in Remington's Pharmaceutical Sciences16th edition, Osol, A. Ed. (1980).

Sustained-release preparations may be prepared. Suitable examples ofsustained-release preparations include semipermeable matrices of solidhydrophobic polymers containing the antibody, which matrices are in theform of shaped articles, e.g. films, or microcapsules.

The formulations to be used for in vivo administration are generallysterile. Sterility may be readily accomplished, e.g., by filtrationthrough sterile filtration membranes.

G. Therapeutic Methods and Compositions

Any of the anti-Jagged antibodies provided herein may be used intherapeutic methods.

In one aspect, an anti-Jagged antibody for use as a medicament isprovided. In further aspects, an anti-Jagged1 antibody for use intreating a disease or disorder associated with aberrant Notch signaling,e.g. a cancer, is provided. In certain embodiments, an anti-Jagged1antibody for use in a method of treatment is provided. In certainembodiments, the invention provides an anti-Jagged1 antibody for use ina method of treating an individual having a cancer comprisingadministering to the individual an effective amount of the anti-Jagged1antibody. In one such embodiment, the method further comprisesadministering to the individual an effective amount of at least oneadditional therapeutic agent, e.g., as described below. In furtheraspects, an anti-Jagged2 antibody for use in treating a cancer isprovided. In certain embodiments, an anti-Jagged2 antibody for use in amethod of treatment is provided. In certain embodiments, the inventionprovides an anti-Jagged2 antibody for use in a method of treating anindividual having a cancer comprising administering to the individual aneffective amount of the anti-Jagged2 antibody. In one such embodiment,the method further comprises administering to the individual aneffective amount of at least one additional therapeutic agent, e.g., asdescribed below.

In further embodiments, the invention provides an anti-Jagged antibodyfor use in inhibiting lung cancer growth. In certain embodiments, theinvention provides an anti-Jagged1 antibody for use in a method ofreducing lung cancer growth in an individual comprising administering tothe individual an effective of the anti-Jagged1 antibody to reducinglung cancer growth. In certain embodiments, the invention provides ananti-Jagged2 antibody for use in a method of reducing lung cancer growthin an individual comprising administering to the individual an effectiveof the anti-Jagged2 antibody to reducing lung cancer growth. In certainembodiments, the invention provides an anti-Jagged1 antibody for use ina method of reducing breast cancer growth in an individual comprisingadministering to the individual an effective of the anti-Jagged1antibody to reducing breast cancer growth. In certain embodiments, theinvention provides an anti-Jagged2 antibody for use in a method ofreducing breast cancer growth in an individual comprising administeringto the individual an effective of the anti-Jagged2 antibody to reducingbreast cancer growth. An “individual” according to any of the aboveembodiments is preferably a human.

In a further aspect, the invention provides for the use of ananti-Jagged antibody in the manufacture or preparation of a medicament.In one embodiment, the medicament is for treatment of a disease ordisorder associated with aberrant Notch signaling. In one embodiment,the medicament is for treatment of a cancer. In a further embodiment,the medicament is for use in a method of treating a cancer comprisingadministering to an individual having a cancer an effective amount ofthe medicament. In one such embodiment, the method further comprisesadministering to the individual an effective amount of at least oneadditional therapeutic agent, e.g., as described below. An “individual”according to any of the above embodiments may be a human.

In a further aspect, the invention provides a method for treating adisease or disorder associated with aberrant Notch signaling. In oneembodiment, the method comprises administering to an individual havingsuch disease or disorder an effective amount of an anti-Jagged antibody.In one embodiment, the method comprises administering to an individualhaving a cancer an effective amount of an anti-Jagged1 antibody. In onesuch embodiment, the method further comprises administering to theindividual an effective amount of at least one additional therapeuticagent, as described below. In one embodiment, the method comprisesadministering to an individual having a cancer an effective amount of ananti-Jagged2 antibody. In one such embodiment, the method furthercomprises administering to the individual an effective amount of atleast one additional therapeutic agent, as described below. An“individual” according to any of the above embodiments may be a human.

In a further aspect, the invention provides a method for inhibitingcancer cell growth in an individual. In one embodiment, the methodcomprises administering to the individual an effective amount of ananti-Jagged1 antibody or anti-Jagged2 antibody to inhibiting cancer cellgrowth. In one embodiment, an “individual” is a human.

In a further aspect, the invention provides pharmaceutical formulationscomprising any of the anti-Jagged antibodies provided herein, e.g., foruse in any of the above therapeutic methods. In one embodiment, apharmaceutical formulation comprises any of the anti-Jagged antibodiesprovided herein and a pharmaceutically acceptable carrier. In anotherembodiment, a pharmaceutical formulation comprises any of theanti-Jagged antibodies provided herein and at least one additionaltherapeutic agent, e.g., as described below.

Antibodies of the invention can be used either alone or in combinationwith other agents in a therapy. For instance, an antibody of theinvention may be co-administered with at least one additionaltherapeutic agent. In certain embodiments, an additional therapeuticagent is a cytotoxic agent. In certain embodiments, an additionaltherapeutic agent is an antibody.

Such combination therapies noted above encompass combined administration(where two or more therapeutic agents are included in the same orseparate formulations), and separate administration, in which case,administration of the antibody of the invention can occur prior to,simultaneously, and/or following, administration of the additionaltherapeutic agent or agents. In one embodiment, administration of theanti-Jagged antibody and administration of an additional therapeuticagent occur within about one month, or within about one, two or threeweeks, or within about one, two, three, four, five, or six days, of eachother. Antibodies of the invention can also be used in combination withradiation therapy.

An antibody of the invention (and any additional therapeutic agent) canbe administered by any suitable means, including parenteral,intrapulmonary, and intranasal, and, if desired for local treatment,intralesional administration. Parenteral infusions includeintramuscular, intravenous, intraarterial, intraperitoneal, orsubcutaneous administration. Dosing can be by any suitable route, e.g.by injections, such as intravenous or subcutaneous injections, dependingin part on whether the administration is brief or chronic. Variousdosing schedules including but not limited to single or multipleadministrations over various time-points, bolus administration, andpulse infusion are contemplated herein.

Antibodies of the invention would be formulated, dosed, and administeredin a fashion consistent with good medical practice. Factors forconsideration in this context include the particular disorder beingtreated, the particular mammal being treated, the clinical condition ofthe individual patient, the cause of the disorder, the site of deliveryof the agent, the method of administration, the scheduling ofadministration, and other factors known to medical practitioners. Theantibody need not be, but is optionally formulated with one or moreagents currently used to prevent or treat the disorder in question. Theeffective amount of such other agents depends on the amount of antibodypresent in the formulation, the type of disorder or treatment, and otherfactors discussed above. These are generally used in the same dosagesand with administration routes as described herein, or about from 1 to99% of the dosages described herein, or in any dosage and by any routethat is empirically/clinically determined to be appropriate.

For the prevention or treatment of disease, the appropriate dosage of anantibody of the invention (when used alone or in combination with one ormore other additional therapeutic agents) will depend on the type ofdisease to be treated, the type of antibody, the severity and course ofthe disease, whether the antibody is administered for preventive ortherapeutic purposes, previous therapy, the patient's clinical historyand response to the antibody, and the discretion of the attendingphysician. The antibody is suitably administered to the patient at onetime or over a series of treatments. Depending on the type and severityof the disease, about 1 μg/kg to 15 mg/kg (e.g. 0.1 mg/kg-10 mg/kg) ofantibody can be an initial candidate dosage for administration to thepatient, whether, for example, by one or more separate administrations,or by continuous infusion. One typical daily dosage might range fromabout 1 μg/kg to 100 mg/kg or more, depending on the factors mentionedabove. For repeated administrations over several days or longer,depending on the condition, the treatment would generally be sustaineduntil a desired suppression of disease symptoms occurs. One exemplarydosage of the antibody would be in the range from about 0.05 mg/kg toabout 10 mg/kg. Thus, one or more doses of about 0.5 mg/kg, 2.0 mg/kg,4.0 mg/kg or 10 mg/kg (or any combination thereof) may be administeredto the patient. Such doses may be administered intermittently, e.g.every week or every three weeks (e.g. such that the patient receivesfrom about two to about twenty, or e.g. about six doses of theantibody). An initial higher loading dose, followed by one or more lowerdoses may be administered. An exemplary dosing regimen comprisesadministering an initial loading dose of about 4 mg/kg, followed by aweekly maintenance dose of about 2 mg/kg of the antibody. However, otherdosage regimens may be useful. The progress of this therapy is easilymonitored by conventional techniques and assays.

It is understood that any of the above formulations or therapeuticmethods may be carried out using an immunoconjugate of the invention inplace of or in addition to an anti-Jagged antibody.

H. Articles of Manufacture

In another aspect of the invention, an article of manufacture containingmaterials useful for the treatment, prevention and/or diagnosis of thedisorders described above is provided. The article of manufacturecomprises a container and a label or package insert on or associatedwith the container. Suitable containers include, for example, bottles,vials, syringes, IV solution bags, etc. The containers may be formedfrom a variety of materials such as glass or plastic. The containerholds a composition which is by itself or combined with anothercomposition effective for treating, preventing and/or diagnosing thecondition and may have a sterile access port (for example the containermay be an intravenous solution bag or a vial having a stopper pierceableby a hypodermic injection needle). At least one active agent in thecomposition is an antibody of the invention. The label or package insertindicates that the composition is used for treating the condition ofchoice. Moreover, the article of manufacture may comprise (a) a firstcontainer with a composition contained therein, wherein the compositioncomprises an antibody of the invention; and (b) a second container witha composition contained therein, wherein the composition comprises afurther cytotoxic or otherwise therapeutic agent. The article ofmanufacture in this embodiment of the invention may further comprise apackage insert indicating that the compositions can be used to treat aparticular condition. Alternatively, or additionally, the article ofmanufacture may further comprise a second (or third) containercomprising a pharmaceutically-acceptable buffer, such as bacteriostaticwater for injection (BWFI), phosphate-buffered saline, Ringer's solutionand dextrose solution. It may further include other materials desirablefrom a commercial and user standpoint, including other buffers,diluents, filters, needles, and syringes.

It is understood that any of the above articles of manufacture mayinclude an immunoconjugate of the invention in place of or in additionto an anti-Jagged antibody.

III. Examples

The following are examples of methods and compositions of the invention.It is understood that various other embodiments may be practiced, giventhe general description provided above.

Example 1 Generation of Anti-Jagged Antibodies

a. Library Sorting and Screening to Identify Anti-Jagged1/2 Antibodies

Human phage antibody libraries with synthetic diversities in theselected complementarity determining regions, mimicking the naturaldiversity of human IgG repertoire, were used for panning Fab fragmentsdisplayed on the surface of M13 bacteriophage particles. HumanJag1-DSL-EGF1-4 (SEQ ID NO:6) or human Jag2-DSL-EGF1-4 (SEQ ID NO:8) wasused as antigen for library sorting. Nunc 96 well Maxisorp immunoplateswere coated overnight at 4° C. with target antigen (10 μg/ml) and wereblocked for 1 hour at room temperature with phage blocking buffer PBST(phosphate-buffered saline (PBS) and 1% (w/v) bovine serum albumin (BSA)and 0.05% (v/v) tween-20). Antibody phage libraries VH (see, e.g., Leeet al., J. Immunol. Meth. 284:119-132 (2004)) and VH/VL (see Liang etal., JMB. 366: 815-829 (2007)) were added to antigen plates separatelyand incubated overnight at room temperature. The following dayantigen-coated plates were washed ten times with PBT (PBS with 0.05%Tween-20), and bound phage were eluted with 50 mM HCl and 500 mM NaClfor 30 minutes and neutralized with an equal volume of 1 M Tris base(pH7.5). Recovered phages were amplified in E. coli XL-1 Blue cells.During the subsequent selection rounds, incubation of antibody phagewith the antigen-coated plates was reduced to 2-3 hours, and thestringency of plate washing was gradually increased.

After 4 rounds of panning, significant enrichment was observed. 96clones were picked each from VH and VH/VL library sorting to determinewhether they specifically bound to human Jagged1 or Jagged2. Thevariable regions of these clones were PCR sequenced to identify uniquesequence clones. The affinities of phage antibodies were ranked usingspot competition ELISA. The phage antibody IC50 values were furtherdetermined using competitive phage-binding ELISA. Unique phageantibodies that bind specifically to human Jagged1 (and not Jagged2),Jagged2 (and not Jagged1), or to both Jagged1 and Jagged2 were chosenand reformatted to full-length IgGs for evaluation in in vitro cellassays.

Clones of interest were reformatted into IgGs by cloning V_(L) and V_(H)regions of individual clones into a pRK mammalian cell expression vector(pRK.LPG3.HumanKappa) containing the human kappa constant domain, andexpression vector (pRK.LPG4.HumanHC) encoding the full-length human IgG1constant domain, respectively (Shields et al., J Biol Chem 2000; 276:6591-6604). The antibodies were then transiently expressed in mammalianCHO cells, and purified with a protein A column.

b. Construction of Libraries for Affinity Improvement of Clones Derivedfrom the V_(H) or V_(H)V_(L) Libraries

Phagemid pW0703, derived from phagemid pV0350-2b (Lee et al., J. Mol.Biol 340, 1073-1093 (2004), containing stop codon (TAA) in all CDR-L3positions and displaying monovalent Fab on the surface of M13bacteriophage) served as the library templates for grafting heavy chainvariable domains (V_(H)) of clones of interest from the V_(H) libraryfor affinity maturation. Both hard and soft randomization strategieswere used for affinity maturation. For hard randomization, one lightchain library with selected positions of the three light chain CDRs wasrandomized using amino acids designed to mimic natural human antibodiesand the designed DNA degeneracy was as described in Lee et al. (J. Mol.Biol 340, 1073-1093 (2004)). To achieve the soft randomizationconditions, which introduced the mutation rate of approximately 50% atthe selected positions, the mutagenic DNA was synthesized with70-10-10-10 mixtures of bases favoring the wild type nucleotides (Gallopet al., Journal of Medicinal Chemistry 37:1233-1251 (1994)). For softrandomization, residues at positions 91-96 of CDR-L3, 30-33, 35 ofCDR-H1, 50, 52, 53-54, and 56 of CDR-H2, 95-98 of CDR-H3 were targeted;and three different combinations of CDR loops, H1/L3, H2/L3, and H3/L3,were selected for randomization.

For clones originated from V_(H)V_(L) library, phagemids containing 4stop codons (TAA) in each CDR and displaying monovalent Fab on thesurface of M13 bacteriophage were generated individually, and served asthe templates for kunkel mutagenesis for the construction of affinitymaturation libraries. Only soft randomization strategy was used forclones derived from V_(H)V_(L) library, as diversity of CDR-L3 was builtinto the naïve library. To achieve the soft randomization conditions,residues at positions 28-31 of CDR-L1, 50, 53-55 of CDR-L2, 91-96 ofCDR-L3, 30-35 of CDR-H1, 50-56 of CDR-H2, 95-100 of CDR-H3 weretargeted; and four different combinations of CDR loops, H1/L3*, H2/L3*,and H3/L3* and L1/L2/L3* (where * denotes the position of stop codons onthe template), were selected for randomization.

c. Phage Sorting Strategy to Generate Affinity Improvement

For affinity improvement selection, Jag1 or Jag2 antigens were firstbiotinylated under limiting reagent condition. Phage libraries weresubjected to one round of plate sorting and five rounds of solutionsorting with increasing stringency. For the first round of platesorting, 10 ug/ml antigen was first coated on Maxisorp plate andpreblocked with blocking buffer (1% BSA and 0.05% Tween20 in PBS). 3O.D./ml in blocking buffer of phage input were incubated to antigenplates for 3 hours. The wells were washed with PBS-0.05% Tween20 tentimes. Bound phage was eluted with 150 μl/well 50 mM HCl, 500 mM KCl for30 minutes, and subsequently neutralized by 50 μl/well of 1M Tris pH8,titered, and propagated for the next round. For subsequent rounds,panning of the phage libraries was done in solution phase, where phagelibrary was incubated with 100 nM biotinylated target protein (theconcentration is based on parental clone phage IC50 value) in 100 μlbuffer containing 1% Superblock (Pierce Biotechnology) and 0.05% Tween20for 2 hours at room temperature. The mixture was further diluted 10×with 1% Superblock, and 100 μl/well was applied to neutravidin-coatedwells (10 μg/ml) for 30 minutes at room temperature with gentle shaking.To determine background binding, control wells containing phage werecaptured on neutravidin-coated plates. Bound phage was then washed,eluted and propagated as described for first round. Five more rounds ofsolution sorting were carried out together with increasing selectionstringency. The first couple rounds of which is for on-rate selection bydecreasing biotinylated target protein concentration from 100 nM to 0.1nM, and the last two rounds of which is for off-rate selection by addingexcess amounts of non-biotinylated target protein (300 to 1000 foldmore) to compete off weaker binders at room temperature.

d. High Throughput Affinity Screening ELISA (Single Spot Competition)

Colonies were picked from the sixth round of screening. Colonies weregrown overnight at 37° C. in 150 μl/well of 2YT media with 50 μg/mlcarbenicillin and 1×10¹⁰/ml M13KO7 in 96-well plate (Falcon). From thesame plate, a colony of XL-1 infected parental phage was picked ascontrol. 96-well Nunc Maxisorp plates were coated with 100 μl/well ofeither Jag1 or Jag2 (0.5 μg/ml) in PBS at 4° C. overnight. The plateswere blocked with 150 μl of 1% BSA and 0.05% Tween20 in PBS 20 for 1hour.

35 μl of the phage supernatant was diluted with to 75 μl of in ELISA(enzyme linked immunosorbent assay) buffer (PBS with 0.5% BSA, 0.05%Tween20) with or without 5 nM Jag1 or Jag2 and let incubate for 1 hourat room temperature in an F plate (NUNC). 95 μl of mixture wastransferred side by side to the antigen coated plates. The plate wasgently shaken for 15 min and was washed ten times with PBS-0.05% Tween20. The binding was quantified by adding horseradish peroxidase(HRP)-conjugated anti-M13 antibody in ELISA buffer (1:2500) andincubated for 30 minutes at room temperature. The plates were washedwith PBS-0.05% Tween 20 ten times. Next, 100 μl/well of Peroxidasesubstrate was added to the well and incubated for 5 minutes at roomtemperature. The reaction was stopped by adding 100 μl 0.1M PhosphoricAcid (H₃PO₄) to each well and allowed to incubate for 5 minutes at roomtemperature. The O.D. (optical density) of the yellow color in each wellwas determined using a standard ELISA plate reader at 450 nm. Incomparison to the OD_(450nm) reduction (%) of the well of parental phage(100%), clones that had the OD_(450nm) reduction (%) lower than 50% werepicked for sequence analysis. Unique clones were selected for phagepreparation to determine binding affinity (phage IC50) against eitherJag1 or Jag2 by comparison to respective parental clones. Then the mostaffinity-improved clones were reformatted into human IgG1 for antibodyproduction and further BIAcore binding kinetic analysis and other invitro or in vivo assay.

Example 2 Specific Binding of Antibodies Generated Against Jagged1 orJagged2 Antigens

Antibodies D-1 (FIG. 10A, left panel) and C-1 (FIG. 10A, right panel)were tested for binding to recombinant purified Notch ligands humanJagged1 (hJag-1), human Jagged2 (hJag-2), murine Jagged2 (mJag-2), humanDelta-like 1 (hDLL1), murine Delta-like 1 (mDLL1), and human Delta-like4 (hDLL4) using a standard enzyme-linked immunosorbent assay (ELISA). 1μg/ml of Notch ligand protein in PBS, pH7.4, were coated on ELISA plates(Nunc Maxisorp) at 40° C. overnight, including human Jagged1, human andmurine Jagged2, human and murine Delta-like 1 (DLL-1). Plates wereblocked with Casein blocker in PBS (Pierce) for one hour at roomtemperature. Serial 3-fold dilutions of anti-Jagged1/2 IgGs in PBSTbuffer (PBT buffer (PBS+0.05% (v/v) Tween 20) with 0.5% (w/v) BSA) wereadded to the plates and incubated for one hour at room temperature. Theplates were then washed with PBST and bound antibodies were detectedwith peroxidase-conjugated goat anti-human Fab specific IgG (Sigma). TMBsubstrate (3,3′,5,5′-tetramethylbenzidine) was used and absorbance at650 nM was read using a standard ELISA plate reader. Absorbance wasplotted against concentrations of IgGs using KaleidaGraph (SynergySoftware). FIG. 10A depicts the results, with OD₄₅₀ on the y-axisrepresenting the extent of binding. None of the antibodies obtained inthe first round of antibody screening described in Example 1 selectivelyrecognized only Jagged1 or only Jagged2. D-1 binds human and mouseJagged1 as well as human and murine Jagged2 (FIG. 10A, left panel, anddata not shown). C-1 binds human and murine Jagged1, human and murineJagged2, and human and murine Delta-like 1 (FIG. 10A, right panel, anddata not shown). Neither antibody bound to human Delta-like 4.

Further screening rounds identified antibodies specific for only one ofthe Jagged family members, as determined by ELISA. Antibody A boundhuman and murine Jagged1, but not Jagged2 (FIG. 10B). Conversely,antibody B bound human and murine Jagged2, but not Jagged1 (FIG. 10B).C-1 served as a control for binding to both Jagged1 and Jagged2.

Example 3 Antibody Binding Affinities and Epitope Mapping

Binding affinities of anti-Jagged1/2 phage antibodies were measured bySurface Plasmon Resonance (SRP) using a BIAcore™-3000 instrument.Anti-Jagged1/2 phage human IgGs were captured by mouse anti-human IgGcoated on the CM5 sensor chip to achieve approximately 150 responseunits (RU). For kinetics measurements, two-fold serial dilutions ofhuman or mouse Jag1/2 DSL_EGF1-4 (1.95 nM to 250 nM) were injected inPBT buffer (PBS with 0.05% Tween 20) at 25° C. with a flow rate of 30ml/min. Association rates (k_(on)) and dissociation rates (k_(off)) werecalculated using a simple one-to-one Langmuir binding model (BIAcoreEvaluation Software version 3.2). The equilibrium dissociation constant(k_(d)) was calculated as the ratio k_(off)/k_(on).

FIG. 11 summarizes the binding constants for antibodies A, A-1, A-2, B,B-1, B-2, B-3, B-4, C, C-1, D, D-1, and D-2 binding to purified humanJagged1, human Jagged2, and mouse Jagged2. Parent antibody Aspecifically bound to human and murine Jagged1 (FIG. 11 and data notshown). The affinity matured antibodies A-1 and A-2 bound both human andmurine Jagged1 with high affinity (FIG. 11). Antibodies A, A-1 and A-2did not bind human or murine Jagged2 (FIG. 11). Conversely, none ofantibody B, B-1, B-2, B-3, or B-4 bound human or murine Jagged1. Theaffinity matured antibodies B-1, B-2, B-3, or B-4 specifically bound tohuman and mouse Jagged2 (FIG. 11 and data not shown). Antibodies C, C-1,D, D-1, D-2, D-3, D-4, and D-5 bound to both human and murine Jagged1and Jagged2 (FIG. 11). With regard to Jagged1, binding of antibodies C,C-1, D, D-1, D-2, D-3, D-4, and D-5 was mapped to a DSL-EGF1-4 fragmentof Jagged1 using H ISA cross-blocking experiments.

Example 4 Anti-Jagged Antagonist Antibodies Inhibit Jagged1-InducedSignaling In Vitro

To determine whether anti-Jagged antibodies can act as antagonists ofJagged-induced Notch signaling, co-culture experiments were performedessentially as described by Wu et al., Nature 464, 1052-1057 (15 Apr.2010). NIH-3T3 cells engineered to express Jagged1, as the Notch ligand,were co-cultured with NIH 3T3 cells that stably express Notch1 and thatwere transiently transfected to express a Notch-responsive TP-1 (12XCSL) firefly luciferase reporter and a constitutively expressed Renillaluciferase reporter (pRL-CMV, Promega). Strong Notch reporter signal(Firefly luciferase) was observed in the co-culture (FIG. 12, J1induced-Positive Control). Reporter expression was reduced to backgroundlevels when a γ-secretase inhibitor was added to the co-culture (FIG.12, Compound E+), demonstrating Notch-dependent expression of thereporter construct.

Addition of increasing amounts (0.4-50 μg/ml) of anti-Jagged antibodiesC or D resulted in dose-dependent inhibition of reporter expression(FIG. 12, compare C and D to J1 induced-Positive Control). In contrast,an isotype control antibody that does not recognize Jagged or Notch didnot significantly reduce reporter gene expression (FIG. 12, Ab IsotypeControl). Taken together these results demonstrate that antibodies C andD act as antagonists, i.e., inhibit Jagged1-mediated signaling throughthe Notch receptor Notch1 in a dose-dependent manner.

Similar results were obtained with affinity-matured antibodies tested inthe above-described co-culture assay for their ability to inhibitJagged1-mediated Notch signaling. As the respective parental antibodiesC and D, affinity-matured antibodies C-1, D-1, D-2, D-3, D-4 and D-5inhibited Jagged1-mediated Notch signaling in a dose-dependent manner,whereas no inhibition was observed for the isotype control (FIG. 13A).

Example 5 Anti-Jagged Antagonist Antibodies Inhibit Jagged1-InducedSignaling In Vitro

Antibodies C and D, and their respective affinity-matured descendants,bind to both human and murine Jagged1, and human and murine Jagged2(e.g., FIG. 10A). To determine whether antibodies selective for Jagged1only or Jagged2 only could selectively inhibit Jagged1 and/or 2-inducedNotch signaling, respectively, the co-culture experiments described inExample 4 were repeated with the Jagged1-specific antibody A-2 or theJagged2-specific antibody B-3. Signaling was induced by Jagged1 (FIG.13B, dark gray columns) or by Jagged2 (FIG. 13B, light gray columns) andinhibition was determined as described in Example 4 using the antibodiesat concentrations of 0.016-50 μg/ml. Controls included cultures thatwere not stimulated with ligand and not treated with antibody (FIG. 1B3,Untreated), not stimulated with ligand (FIG. 13B, No Stimulation or3T3P), treated with 5-10 μg/ml isotype control antibody (FIG. 13B, agDor gD), stimulated with ligand but not treated with antibody (Stim/no ABor No Ab), treated with 5 μM of the gamma-secretase inhibitor DAPT orthe DAPT vehicle control of DMSO.

Antibody A-2 inhibited Jagged1-induced signaling, but notJagged2-induced signaling, in a dose-dependent manner (FIG. 13B, topleft panel). The IC₅₀ for A-2 was between 2 and 10 μg/ml for Jagged1inhibition whereas little or no Jagged2 inhibition was observed even atthe highest concentration of 50 μg/ml. The results demonstrate thatantibody A-2 is a Jagged1-selective antagonist, i.e., antibody A-2inhibits Jagged1-mediated signaling, but not Jagged2-mediated signaling.In contrast, antibody B-3 potently inhibited Jagged2-induced signalingat the lowest concentration tested but did not inhibit Jagged1-inducedsignaling at the highest concentration tested, thus establishing B-3 asa Jagged1-selective antagonist (bottom left panel). Antibody C-1inhibited both Jagged1- and Jagged2-induced signaling, in adose-dependent manner (top right panel). Taken together, the resultsshow that A-2 and B-3 function as Jagged1 and Jagged2 selectiveinhibitors, respectively, whereas C-1 functions as an inhibitor of bothJagged1 and Jagged2.

Example 6 Effect of Anti-Jagged Antibody Treatment on Body Weight

As described above, gamma-secretase inhibitors, and other inhibitors ofmultiple Notch receptors, cause weight loss and intestinal goblet cellmetaplasia, which is undesirable for clinical administration. Todetermine how the antibodies described herein affect body weight andintestinal health, mice were dosed twice per week with theanti-Jagged1/2 antibody C-1 (5-10 mg antibody per kg mouse body weight(mpk)), the anti-Jagged1 antibody A-2 (5-20mpk), the anti-Jagged2antibody B-3 (5-20mpk), the antibody A-2 and B-3 together (5mpk each) orthe isotype control anti-gD antibody (20mpk). The isotype controlantibody was also used to bring the total antibody concentration of eachdosing to 20 mpk. Total body weight of each mouse was determined priorto first administration of antibodies and monitored until day 12 of thestudy. The average body weight changes are depicted in FIG. 14, graphedas a percentage of starting body weight. Dual inhibition of Jagged1 andJagged2, using either the anti-Jagged1/2 antibody C-1 or a combinationof the Jagged1-specific antibody A-2 and the Jagged2-specific antibodyB-3 together, caused rapid and substantial weight loss (FIG. 14A). Byday 4, some mice that received the anti-Jagged1/2 antibody C-1 had lostover 5% of their bodyweight, which progressed to nearly 8-10% loss inbody weight by day 7(FIG. 14A). Mice that received both A-2 and B-3 alsolost weight rapidly, in some cases up to 17% by day 11 (FIG. 14A). Incontrast, none of the Jagged1-specific or Jagged2-specific antibodiesalone caused weight loss over the course of the study at either 5 or20mpk (FIG. 14A). Treatment with the combination of anti-Jagged1 plusanti-Jagged2 antibodies resulted in decreased food intake (FIG. 14B),which correlated with the observed decrease in body weight (FIG. 14A)and suggested that decreased food intake could partly or entirelyaccount for the correlated body weight decreases.

Example 7 Intestinal Histology Following Anti-Jagged Antibody Treatment

Pan-Notch inhibition, e.g., by gamma-secretase inhibitors, as well ascombined inhibition of Notch1 plus Notch2 or D111 plus D114 (see Wu etal., Nature 2010; Pellegrinet et al., Gastroenterology, 2011), causesgoblet cell metaplasia in mice, and this metaplasia has beenhypothesized to be responsible for the observed weight loss.

To determine if the rapid loss of body weight following combinedinhibition of Jagged1 and Jagged2 observed in Example 6 was similarlyassociated with goblet cell metaplasia, intestinal samples of the micetreated as described in Example 6 were isolated and examined Intestineswere stained with hematoxylin and eosin (FIG. 15A, H & E) or with AlcianBlue for mucous, a marker of secretory goblet cells (FIG. 15A, AlcianBlue). Some samples were analyzed by immunohistochemistry for expressionof lysozyme, a marker of Paneth cells, or for the proliferation markerKi-67 (FIG. 15B). No obvious differences could be observed betweenhistology or marker expression in intestinal sections of mice treatedwith either control antibody or the anti-Jagged1/2 antibody C-1. Theseresults suggest that the weight loss observed following inhibition ofboth Jagged1 and 2 cannot be attributed to goblet cell metaplasia.Moreover, these results uncover a novel mechanism for weight lossfollowing treatment with Notch inhibitors, indicating that goblet cellmetaplasia may be insufficient to explain weight loss followingtreatment with pan-Notch inhibitors.

Example 8 Anti-Jagged1 Antagonist Antibodies Inhibit Human Lung CancerCell Growth In Vivo

Harlan athymic nude mice were inoculated subcutaneously with Calu-6cells, a human non-small cell lung cancer line. After tumor volumereached approximately 200 cubic mm, mice were injected intraperitoneally(IP) twice per week (days 0, 4, 7, 11, 14 and 18) with 20 mpk of eitheranti-gD isotype control antibody (n=10) or with anti-Jagged1 antibodyA-2 (n=10). Tumor volume in each mouse was measured with calipers foranother 19 days. Total body weight of each mouse was monitored over thecourse of the study.

Tumors in mice treated with anti-Jagged1 showed a significant decreasein tumor volume relative to tumors in the control group (FIG. 16A). Theeffect of the anti-Jagged1 antibody treatment could be detected as earlyas day seven after treatment (FIG. 16A). At day 18, the average tumorvolume in mice that received the anti-Jagged1 antibody reachedapproximately 500 mm³, while average tumor volume in control animalsreached approximately 750 mm³ at day 18. No significant change in bodyweight between the treatment and control group could be observed (FIG.16B).

Example 9 Anti-Jagged1 and Anti-Jagged2 Antibodies Inhibit Human BreastCancer Cell Growth In Vivo

C.B-17 SCID.bg mice were inoculated in the mammary fat pad withMDA-MD-468 cells, a human basal breast cancer line. After tumor volumereached approximately 200 cubic mm, mice were dosed IP with 30 mpk ofeither anti-gD isotype control antibody (human IgG1 isotype),anti-ragweed isotype control antibody (murine IgG2a isotype),anti-Jagged1 antibody A-2 in the human IgG1 backbone, anti-Jagged1antibody A-2 in the murine IgG2a backbone or anti-Jagged2 antibody B-3in the human IgG1 backbone on days 0, 4, 7, 12, 15, 18, 22, 25, 29, 32,36, 43, 50, and 57. Tumor volume (y-axis) was measured with calipers for60 days after the first injection. The tumor volumes for each group (n=9per group) were plotted using a linear mixed effects model (FIG. 17A).Tumor volumes for each mouse in each group are depicted in FIG. 17B.

All three anti-Jagged antibodies significantly inhibited tumor growth.Both anti-Jagged1 antibodies inhibited tumor growth to a similar extent,demonstrating that the observed anti-tumor growth properties areconsistent and independent of the antibody backbone.

Although the foregoing invention has been described in some detail byway of illustration and example for purposes of clarity ofunderstanding, the descriptions and examples should not be construed aslimiting the scope of the invention. The disclosures of all patent andscientific literature cited herein are expressly incorporated in theirentirety by reference.

What is claimed is:
 1. An isolated antibody that binds to Jagged1, theantibody comprising at least one, two, three, four, five, or six HVRsselected from: (a) HVR-H1 comprising the amino acid sequence of SEQ IDNO:81; (b) HVR-H2 comprising an amino acid sequence of SEQ ID NO:84; (c)HVR-H3 comprising an amino acid sequence of SEQ ID NO:87; (d) HVR-L1comprising the amino acid sequence of SEQ ID NO:110; (e) HVR-L2comprising the amino acid sequence of SEQ ID NO:111; and (f) HVR-L3comprising an amino acid sequence of SEQ ID NO:114.
 2. The antibody ofclaim 1, wherein the antibody comprises: (a) an HVR-H1 comprising theamino acid sequence of SEQ ID NO:81; (b) an HVR-H2 comprising the aminoacid sequence of SEQ ID NO:82; (c) an HVR-H3 comprising the amino acidsequence of SEQ ID NO:85; (d) an HVR-L1 comprising the amino acidsequence of SEQ ID NO:110; (e) an HVR-L2 comprising the amino acidsequence of SEQ ID NO:111; and (f) an HVR-L3 comprising the amino acidsequence of SEQ ID NO:112.
 3. The antibody of claim 1, wherein theantibody comprises: (a) an HVR-H1 comprising the amino acid sequence ofSEQ ID NO:81; (b) an HVR-H2 comprising the amino acid sequence of SEQ IDNO:82; (c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:86;(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:110; (e)an HVR-L2 comprising the amino acid sequence of SEQ ID NO:111; and (f)an HVR-L3 comprising the amino acid sequence of SEQ ID NO:113.
 4. Theantibody of claim 1, wherein the antibody comprises: (a) an HVR-H1comprising the amino acid sequence of SEQ ID NO:81; (b) an HVR-H2comprising the amino acid sequence of SEQ ID NO:83; (c) an HVR-H3comprising the amino acid sequence of SEQ ID NO:85; (d) an HVR-L1comprising the amino acid sequence of SEQ ID NO:110; (e) an HVR-L2comprising the amino acid sequence of SEQ ID NO:111; and (f) an HVR-L3comprising the amino acid sequence of SEQ ID NO:112.
 5. An isolatedantibody that binds to Jagged2, the antibody comprising at least one,two, three, four, five, or six HVRs selected from: (a) HVR-H1 comprisingthe amino acid sequence of SEQ ID NO:88; (b) HVR-H2 comprising the aminoacid sequence of SEQ ID NO:89; (c) HVR-H3 comprising an amino acidsequence of SEQ ID NO:94; (d) HVR-L1 comprising the amino acid sequenceof SEQ ID NO:115; (e) HVR-L2 comprising the amino acid sequence of SEQID NO:116; and (f) HVR-L3 comprising an amino acid sequence of SEQ IDNO:122.
 6. The antibody of claim 5, wherein the antibody comprises: (a)an HVR-H1 comprising the amino acid sequence of SEQ ID NO:88 (b) anHVR-H2 comprising the amino acid sequence of SEQ ID NO:89; (c) an HVR-H3comprising the amino acid sequence of SEQ ID NO:90; (d) an HVR-L1comprising the amino acid sequence of SEQ ID NO:115; (e) an HVR-L2comprising the amino acid sequence of SEQ ID NO:116; and (f) an HVR-L3comprising the amino acid sequence of SEQ ID NO:117.
 7. The antibody ofclaim 5, wherein the antibody comprises: (a) an HVR-H1 comprising theamino acid sequence of SEQ ID NO:88; (b) an HVR-H2 comprising the aminoacid sequence of SEQ ID NO:89; (c) an HVR-H3 comprising the amino acidsequence of SEQ ID NO:91; (d) an HVR-L1 comprising the amino acidsequence of SEQ ID NO:115; (e) an HVR-L2 comprising the amino acidsequence of SEQ ID NO:116; and (f) an HVR-L3 comprising the amino acidsequence of SEQ ID NO:118.
 8. The antibody of claim 5, wherein theantibody comprises: (a) an HVR-H1 comprising the amino acid sequence ofSEQ ID NO:88; (b) an HVR-H2 comprising the amino acid sequence of SEQ IDNO:89; (c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:90;(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:115; (e)an HVR-L2 comprising the amino acid sequence of SEQ ID NO:116; and (f)an HVR-L3 comprising the amino acid sequence of SEQ ID NO:119.
 9. Theantibody of claim 5, wherein the antibody comprises: (a) an HVR-H1comprising the amino acid sequence of SEQ ID NO:88; (b) an HVR-H2comprising the amino acid sequence of SEQ ID NO:89; (c) an HVR-H3comprising the amino acid sequence of SEQ ID NO:92; (d) an HVR-L1comprising the amino acid sequence of SEQ ID NO:115; (e) an HVR-L2comprising the amino acid sequence of SEQ ID NO:116; and (f) an HVR-L3comprising the amino acid sequence of SEQ ID NO:120.
 10. The antibody ofclaim 5, wherein the antibody comprises: (a) an HVR-H1 comprising theamino acid sequence of SEQ ID NO:88; (b) an HVR-H2 comprising the aminoacid sequence of SEQ ID NO:89; (c) an HVR-H3 comprising the amino acidsequence of SEQ ID NO:93; (d) an HVR-L1 comprising the amino acidsequence of SEQ ID NO:115; (e) an HVR-L2 comprising the amino acidsequence of SEQ ID NO:116; and (f) an HVR-L3 comprising the amino acidsequence of SEQ ID NO:121.
 11. An isolated antibody that binds toJagged1/2, the antibody comprising at least one, two, three, four, five,or six HVRs selected from: (a) an HVR-H1 comprising the amino acidsequence of SEQ ID NO:95; (b) an HVR-H2 comprising the amino acidsequence of SEQ ID NO:96; (c) an HVR-H3 comprising an amino acidsequence of SEQ ID NO:99; (d) an HVR-L1 comprising the amino acidsequence of SEQ ID NO:123; (e) an HVR-L2 comprising the amino acidsequence of SEQ ID NO:124; and (f) an HVR-L3 comprising an amino acidsequence of SEQ ID NO:127.
 12. The antibody of claim 11, wherein theantibody comprises: (a) an HVR-H1 comprising the amino acid sequence ofSEQ ID NO:95; (b) an HVR-H2 comprising the amino acid sequence of SEQ IDNO:96; (c) an HVR-H3 comprising the amino acid sequence of SEQ ID NO:97;(d) an HVR-L1 comprising the amino acid sequence of SEQ ID NO:123; (e)an HVR-L2 comprising the amino acid sequence of SEQ ID NO:124; and (f)an HVR-L3 comprising the amino acid sequence of SEQ ID NO:125.
 13. Theantibody of claim 11, wherein the antibody comprises: (a) an HVR-H1comprising the amino acid sequence of SEQ ID NO:95; (b) an HVR-H2comprising the amino acid sequence of SEQ ID NO:96; (c) an HVR-H3comprising the amino acid sequence of SEQ ID NO:98; (d) an HVR-L1comprising the amino acid sequence of SEQ ID NO:123; (e) an HVR-L2comprising the amino acid sequence of SEQ ID NO:124; and (f) an HVR-L3comprising the amino acid sequence of SEQ ID NO:126.
 14. An isolatedantibody that binds to Jagged1/2, the antibody comprising at least one,two, three, four, five, or six HVRs selected from: (a) an HVR-H1comprising an amino acid sequence of SEQ ID NO:105; (b) an HVR-H2comprising the amino acid sequence of SEQ ID NO:106; (c) an HVR-H3comprising an amino acid sequence of SEQ ID NO:109; (d) an HVR-L1comprising the amino acid sequence of SEQ ID NO:128; (e) an HVR-L2comprising the amino acid sequence of SEQ ID NO:129; and (f) an HVR-L3comprising an amino acid sequence of SEQ ID NO:134.
 15. The antibody ofclaim 14, wherein the antibody comprises: (a) an HVR-H1 comprising theamino acid sequence of SEQ ID NO:100; (b) an HVR-H2 comprising the aminoacid sequence of SEQ ID NO:106; (c) an HVR-H3 comprising the amino acidsequence of SEQ ID NO:107; (d) an HVR-L1 comprising the amino acidsequence of SEQ ID NO:128; (e) an HVR-L2 comprising the amino acidsequence of SEQ ID NO:129; and (f) an HVR-L3 comprising the amino acidsequence of SEQ ID NO:130.
 16. The antibody of claim 14, wherein theantibody comprises: (a) an HVR-H1 comprising the amino acid sequence ofSEQ ID NO:100; (b) an HVR-H2 comprising the amino acid sequence of SEQID NO:106; (c) an HVR-H3 comprising the amino acid sequence of SEQ IDNO:108; (d) an HVR-L1 comprising the amino acid sequence of SEQ IDNO:128; (e) an HVR-L2 comprising the amino acid sequence of SEQ IDNO:129; and (f) an HVR-L3 comprising the amino acid sequence of SEQ IDNO:131.
 17. The antibody of claim 14, wherein the antibody comprises:(a) an HVR-H1 comprising the amino acid sequence of SEQ ID NO:101; (b)an HVR-H2 comprising the amino acid sequence of SEQ ID NO:106; (c) anHVR-H3 comprising the amino acid sequence of SEQ ID NO:107; (d) anHVR-L1 comprising the amino acid sequence of SEQ ID NO:128; (e) anHVR-L2 comprising the amino acid sequence of SEQ ID NO:129; and (f) anHVR-L3 comprising the amino acid sequence of SEQ ID NO:132.
 18. Theantibody of claim 14, wherein the antibody comprises: (a) an HVR-H1comprising the amino acid sequence of SEQ ID NO:102; (b) an HVR-H2comprising the amino acid sequence of SEQ ID NO:106; (c) an HVR-H3comprising the amino acid sequence of SEQ ID NO:107; (d) an HVR-L1comprising the amino acid sequence of SEQ ID NO:128; (e) an HVR-L2comprising the amino acid sequence of SEQ ID NO:129; and (f) an HVR-L3comprising the amino acid sequence of SEQ ID NO:133.
 19. The antibody ofclaim 14, wherein the antibody comprises: (a) an HVR-H1 comprising theamino acid sequence of SEQ ID NO:103; (b) an HVR-H2 comprising the aminoacid sequence of SEQ ID NO:106; (c) an HVR-H3 comprising the amino acidsequence of SEQ ID NO:107; (d) an HVR-L1 comprising the amino acidsequence of SEQ ID NO:128; (e) an HVR-L2 comprising the amino acidsequence of SEQ ID NO:129; and (f) an HVR-L3 comprising the amino acidsequence of SEQ ID NO:132.
 20. The antibody of claim 14, wherein theantibody comprises: (a) an HVR-H1 comprising the amino acid sequence ofSEQ ID NO:104; (b) an HVR-H2 comprising the amino acid sequence of SEQID NO:106; (c) an HVR-H3 comprising the amino acid sequence of SEQ IDNO:107; (d) an HVR-L1 comprising the amino acid sequence of SEQ IDNO:128; (e) an HVR-L2 comprising the amino acid sequence of SEQ IDNO:129; and (f) an HVR-L3 comprising the amino acid sequence of SEQ IDNO:132.
 21. The antibody of any of claims 1-20, which is a monoclonalantibody.
 22. The antibody of any of claims 1-20, which is a human,humanized, or chimeric antibody.
 23. The antibody of any of claims 1-20,which is an antibody fragment.
 24. The antibody of any of claims 1-20,further comprising a light chain variable domain framework FR1comprising the amino acid sequence of SEQ ID NO:60; FR2 comprising theamino acid sequence of SEQ ID NO:61; FR3 comprising the amino acidsequence of SEQ ID NO:62; and FR4 comprising the amino acid sequence ofSEQ ID NO:135.
 25. The antibody of any of claim 3, 4 or 9, comprising aheavy chain variable domain framework FR1 comprising the amino acidsequence of SEQ ID NO:50; FR2 comprising the amino acid sequence of SEQID NO:136; FR3 comprising the amino acid sequence of SEQ ID NO:57; andFR4 comprising the amino acid sequence of SEQ ID NO:35.
 26. The antibodyof claim 15, comprising a heavy chain variable domain framework FR1comprising the amino acid sequence of SEQ ID NO:50; FR2 comprising theamino acid sequence of SEQ ID NO:48; FR3 comprising the amino acidsequence of SEQ ID NO:57; and FR4 comprising the amino acid sequence ofSEQ ID NO:35.
 27. The antibody of claim 1, comprising (a) a VH sequencehaving at least 95% sequence identity to the amino acid sequence of SEQID NO:10; (b) a VL sequence having at least 95% sequence identity to theamino acid sequence of SEQ ID NO:19; or (c) a VH sequence as in (a) anda VL sequence as in (b).
 28. The antibody of claim 27, comprising a VHsequence of SEQ ID NO:10.
 29. The antibody of claim 27, comprising a VLsequence of SEQ ID NO:19.
 30. An antibody comprising a VH sequence ofSEQ ID NO:10 and a VL sequence of SEQ ID NO:19.
 31. The antibody ofclaim 1, comprising (a) a VH sequence having at least 95% sequenceidentity to the amino acid sequence of SEQ ID NO:11; (b) a VL sequencehaving at least 95% sequence identity to the amino acid sequence of SEQID NO:20; or (c) a VH sequence as in (a) and a VL sequence as in (b).32. The antibody of claim 31, comprising a VH sequence of SEQ ID NO:11.33. The antibody of claim 31, comprising a VL sequence of SEQ ID NO:20.34. An antibody comprising a VH sequence of SEQ ID NO:11 and a VLsequence of SEQ ID NO:20.
 35. The antibody of claim 5, comprising (a) aVH sequence having at least 95% sequence identity to the amino acidsequence of SEQ ID NO:15; (b) a VL sequence having at least 95% sequenceidentity to the amino acid sequence of SEQ ID NO:24; or (c) a VHsequence as in (a) and a VL sequence as in (b).
 36. The antibody ofclaim 35, comprising a VH sequence of SEQ ID NO:15.
 37. The antibody ofclaim 35, comprising a VL sequence of SEQ ID NO:24.
 38. An antibodycomprising a VH sequence of SEQ ID NO:15 and a VL sequence of SEQ IDNO:24.
 39. The antibody of any one of claim 1 or 5, which is a fulllength IgG1 antibody.
 40. The antibody of any one of claims 1-4, whereinthe antibody is an antagonist of Jagged1-mediated signaling.
 41. Theantibody of any one of claims 5-10, wherein the antibody is anantagonist of Jagged2-mediated signaling.
 42. An isolated antibody thatcompetes with the antibody of claim 1 for specific binding to Jagged1.43. An isolated antibody that competes with the antibody of claim 5 forspecific binding to Jagged2.
 44. Isolated nucleic acid encoding theantibody of claim
 1. 45. A host cell comprising the nucleic acid ofclaim
 44. 46. Isolated nucleic acid encoding the antibody of claim 5.47. A host cell comprising the nucleic acid of claim
 46. 48. A method ofproducing an antibody comprising culturing the host cell of any one ofclaim 45 or 47 so that the antibody is produced.
 49. An immunoconjugatecomprising the antibody of any one of claims 1-20 and a cytotoxic agent.50. A pharmaceutical formulation comprising the antibody of any one ofclaims 1-20 and a pharmaceutically acceptable carrier.
 51. The antibodyof any one of claims 1-41 for use as a medicament.
 52. The antibody ofany one of claims 1-41 for use in treating a cancer.
 53. The antibody ofany one of claims 1-41 for use in reducing cancer cell growth.
 54. Useof the antibody of any of claims 1-41 in the manufacture of amedicament.
 55. The use of claim 54, wherein the medicament is fortreating a cancer.
 56. The use of claim 54, wherein the medicament isfor reducing cancer cell growth.
 57. A method of treating an individualhaving a cancer comprising administering to the individual an effectiveamount of the antibody of claim 1-41.
 58. The method of claim 57,wherein the cancer is selected from the group consisting of: breastcancer, lung cancer, brain cancer, cervical cancer, colon cancer, livercancer, bile duct cancer, pancreatic cancer, skin cancer, B-cellmalignancies, and T-cell malignancies.